incertain vs uncertain

incertain and uncertain both are adjectives.

Word	Noun	Adjective	Verb	Adverb
incertain	No	Yes	No	No
uncertain	No	Yes	No	No

As adjectives, incertain and uncertain are synonyms defined as:

incertain and uncertain: lacking or indicating lack of confidence or assurance

Other synonyms of incertain include unsure.

incertain (adjective)	uncertain (adjective)
lacking or indicating lack of confidence or assurance	not established beyond doubt; still undecided or unknown
	lacking or indicating lack of confidence or assurance
	not certain to occur; not inevitable
	not established or confirmed
	ambiguous (especially in the negative)
	not consistent or dependable
	subject to change