il-, im-, in-, ir- (not)
Not following a pattern; not regular
irregular
to make something last longer
prolong
a substance that works against stomach acid
antacid
not present
absent
to stretch out or become larger
expand
Against the law
illegal
to move forward
proceed
a remedy or cure
antidote
sudden or unexpected change
abrupt
true or factual
nonfiction
not having the ability
incapable
to move forward in a company
promotion
looking back at the past and reflecting
retrospective
ridiculous or unbelievable
absurd
to teach, to give knowledge
instruct
impossible to change back to former state
irreversible
to forward a complaint or objection
protest
a medicine that works against colds and allergies
antihistamine
away from common thinking
abstract
not of full quality, ability or strength
impaired
to block a passage
impede
to look forward to something in anticipation
prospect
to go back and install something that was not previously available
retrofit
to stay away from participating
abstain
to send out a sound or smell
emit