unbalanced vs imbalanced

unbalanced and imbalanced both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unbalanced	No	Yes	No	No
imbalanced	No	Yes	No	No

As adjectives, unbalanced and imbalanced are synonyms defined as:

unbalanced (adjective)	imbalanced (adjective)
being or thrown out of equilibrium	being or thrown out of equilibrium
affected with madness or insanity
debits and credits are not equal