insufficient vs deficient

insufficient and deficient both are adjectives.

Word	Noun	Adjective	Verb	Adverb
insufficient	No	Yes	No	No
deficient	No	Yes	No	No

As adjectives, insufficient and deficient are synonyms defined as:

insufficient and deficient: of a quantity not able to fulfill a need or requirement

insufficient (adjective)	deficient (adjective)
of a quantity not able to fulfill a need or requirement	of a quantity not able to fulfill a need or requirement
	inadequate in amount or degree
	falling short of some prescribed norm