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2.
adjective

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 jgrooves September 05, 2010
6 1
 
1.
Causing harm or damage.
Divorce is assumed to have deleterious effects on children.
by Kate Hines January 22, 2008
7 0