Part of speech:
Harmful to character or morality; corruptive:
Causing or able to cause harm; hurtful
Designed or tending to disprove or discredit:
Morally injurious; corrupting; unwholesome
Causing or tending to cause harm, especially to a legal case:
The definition of helpful is someone or something that is useful, that provides assistance or aid, or that is prone to providing aid.
(Slang) Extremely bad (bad enough to make one ill). Generally used indirectly with to be.
Inclined to annoy or vex with playful tricks; naughty
Causing harm or injury
Find another word for deleterious. In this page you can discover 19 synonyms, antonyms, idiomatic expressions, and related words for deleterious, like: injurious, pernicious, unhealthy, harmful, damaging, destructive, detrimental, hurtful, noxious, prejudicial and ruining.