To reduce in quality, condition, or value; to cause to deteriorate — and also to lower someone’s rank, status, or dignity, or to treat them in a way that diminishes their worth; the word with both a physical deterioration dimension and a moral and social one; from Latin de- (down) + gradus (step, rank).

Degrade is the lowering-in-grade word — uniquely in this set, it carries both a physical meaning (to cause something to deteriorate in quality or condition) and a moral/social meaning (to lower someone’s dignity or status, to treat them in a way that diminishes their worth as a person). The word comes from the Latin de- (down) + gradus (step, rank — the same root that gives us grade, gradual, gradient), and both meanings trace to the image of stepping down: material degrades when it steps down in quality; a person is degraded when they are treated as if they occupy a lower step on the scale of human dignity. This dual application — physical degradation of substances and moral degradation of persons — makes degrade the most versatile word in this set, applicable wherever deterioration can be described as a lowering in grade or standing. In environmental contexts: “soil degradation,” “water quality has degraded.” In ethical contexts: “degrading working conditions,” “degrading treatment.”

“Decades of intensive agriculture had degraded the soil to the point where the top layer, once capable of supporting diverse crops without chemical intervention, now required increasing quantities of fertiliser to produce diminishing yields — a process that, left unchecked, the agronomist’s report warned, would within a generation render the land unfit for cultivation of any kind.”

The process of gradually reducing the strength or effectiveness of something through sustained pressure, wear, or loss over time; deterioration through the cumulative effect of continuous small losses — the wearing-away-by-degrees word; the only word in this set that specifically describes the mechanism of gradual wearing-down rather than a resulting state.

Attrition is the wearing-away-by-degrees word — the most process-focused of the five, describing the mechanism of deterioration rather than a state that results from it. The word comes from the Latin attritio (a rubbing against — from atterere, to rub against, to wear down — ad-, to + terere, to rub), and it captures the physical image of stones ground smooth by sustained friction: attrition is the deterioration that happens through the cumulative effect of continuous small losses, pressures, or erosions rather than through a single decisive blow. In military contexts, a war of attrition is one designed to exhaust the enemy through sustained pressure; in HR contexts, staff attrition is the gradual reduction of workforce through departures; in competitive contexts, market share is eroded through attrition. Unlike every other word in this set, attrition is primarily a noun — the attrition of the force, the attrition rate, the war of attrition.

“The campaign had been conceived not as an effort to achieve a decisive military victory but as a sustained war of attrition — to impose costs on the opposing force continuously and across multiple fronts, degrading their supply lines, depleting their reserves, and reducing their ability to maintain an effective defence, until the cumulative burden of losses made continued resistance strategically untenable.”

In a state of disrepair as a result of age and neglect; falling into ruin — an adjective describing specifically physical structures (buildings, walls, bridges, infrastructure) that have deteriorated through long inattention; from Latin dilapidare (to scatter stones — dis-, apart + lapis, stone).

Dilapidated is the physical-structures-in-disrepair adjective — the word for buildings, walls, and infrastructure that have fallen into ruin through age and neglect. The word comes from the Latin dilapidare (to scatter stones — dis-, apart + lapis/lapidis, stone), and the etymology is precise: a dilapidated building is one whose stones have been scattered — whose fabric has broken apart through sustained neglect, leaving it in visible disrepair. Unlike decrepit (which can also apply to people and organisations), dilapidated is specifically a physical-structures word — it describes the condition of things that can be measured, surveyed, and physically repaired. The dilapidated building has broken windows, sagging roofs, crumbling walls; the dilapidation is visible in its physical condition.

“The surveyors’ report documented the extent of the dilapidation systematically: seventeen windows requiring replacement, extensive roof damage affecting two-thirds of the building’s floor area, structural movement in the east wall, and dry rot throughout the ground-floor joists — a cumulative assessment that placed the cost of full restoration at three times the figure the buyer had been quoted in the initial inspection.”

Worn out or ruined because of age or neglect; in an advanced state of decay — an adjective applying to physical structures AND to people, organisations, and systems that have reached a condition of near-total failure through age and long neglect; more extreme than dilapidated; from Latin decrepitus (very old, worn out).

Decrepit is the advanced-decay adjective — more extreme than dilapidated and applicable to people and organisations as well as physical structures. The word comes from the Latin decrepitus (very old, worn out — from de-, intensive + crepitus, creak — the sound of something breaking down), and it describes the condition of having aged to the point of near-total failure: the decrepit building is not merely in disrepair but barely standing; the decrepit institution is not merely weakened but barely functional; the decrepit person is not merely old but worn away to a state of near-complete incapacity. Unlike dilapidated (which is specifically physical and structural), decrepit has always applied to people and organisations as well as to physical things — the range is broader, and the implied severity is greater. The decrepit thing has typically passed the point where ordinary repair or renovation is viable.

“The commission’s report described the administrative apparatus that had been inherited from the previous government as decrepit — not merely understaffed or underfunded, which could have been addressed through additional resources, but structurally incapable of performing its statutory functions, its processes having been allowed to atrophy to the point where fundamental redesign rather than incremental improvement was the only viable option.”

To become progressively worse in quality, condition, or value — the broadest, most general deterioration verb; applicable to anything that can decline: health, relationships, infrastructure, economic conditions, diplomatic relations, environmental quality; the umbrella word when none of the more specific deterioration words precisely fits.

Deteriorate is the general worsening word — the deterioration verb that applies across all domains without specifying mechanism, scope, or degree. The word comes from the Latin deteriorare (to make worse — from deterior, worse, from de-, down + a root implying going below a previous standard), and it describes the general process of becoming progressively worse: health deteriorates, relationships deteriorate, conditions deteriorate, materials deteriorate. Unlike degrade (which implies lowering in grade and carries moral dimension), attrition (which specifies the mechanism of gradual wearing-down), and dilapidated/decrepit (which describe specific states of physical or advanced decay), deteriorate is the neutral, general verb — the word you use when you want to say something is getting worse without specifying how, in what way, or to what degree. This generality makes it the most versatile word in the set, applicable wherever the specific mechanism or resulting state is not the focus.

“The negotiations had deteriorated over the course of three days — the initial atmosphere of cautious goodwill having given way to open mutual suspicion, the technical working groups that had made progress on the first day having reached deadlock on the second, and the principals having arrived at the third session with positions so entrenched that the mediators privately doubted whether any agreement was still achievable.”