deleterious
C1CEFR level
65/100Rarity: rare
FormalRegister
General adjective
Causing harm or damage.
Chronic sleep deprivation has a demonstrably deleterious effect on cognitive performance.
Law adjective
Having a harmful effect, often gradually.
Prolonged exposure to the solvent had a deleterious effect on the workers' lungs.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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