Top definition

1 - having a harmful effect, eg to health

2 - the panicky paranoid state of mind which inspires one to go through old emails, texts, etc, deleting anything which may be vaguely incriminating
I found my girlfriend going through my phone, but it's ok cos I got a bit deleterious last week and wiped those drunk text messages to my ex from my outbox
by jwgrooves September 05, 2010
Get the mug
Get a deleterious mug for your mother-in-law Zora.
Mar 1 Word of the Day
One who has a mania for music.
I am a melomaniac.
by Larstait November 14, 2003
Get the mug
Get a melomaniac mug for your mate Jovana.
Causing harm or damage.
Divorce is assumed to have deleterious effects on children.
by Kate Hines January 22, 2008
Get the merch
Get the deleterious neck gaiter and mug.