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 5, 2010
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Causing harm or damage.
Divorce is assumed to have deleterious effects on children.
by Kate Hines January 22, 2008
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The fucking sweetest metal band.....ever
oh shit! is that deletery?
:shits twice and dies:
fuck ya it is.
by 6942042042069 June 7, 2009
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Dry or Difficult Material impossible to compact.
As I was compacting the material it was Deleterious and it refused to harden and became just a mess.
by Hillratt July 3, 2022
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