- injurious to health: deleterious gases.
- harmful; injurious: deleterious influences.
Origin of deleterious
Synonyms for deleterious
Antonyms for deleterious
Examples from the Web for undeleterious
Historical Examples of undeleterious
It contained inhabitants of as undeleterious and self-satisfied a class of peasantry as ever clustered around a Maypole.
- harmful; injurious; hurtful
Word Origin for deleterious
1640s, from Medieval Latin deleterius, from Greek deleterios "noxious," from deleter "destroyer," from deleisthai "to hurt, injure." Related: Deleteriously; deleteriousness.
- Having a harmful effect; injurious.