uncertain vs undependable

uncertain and undependable both are adjectives.

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

uncertain (adjective)	undependable (adjective)
not established beyond doubt; still undecided or unknown	not worthy of reliance or trust
lacking or indicating lack of confidence or assurance	liable to be erroneous or misleading
not certain to occur; not inevitable
not established or confirmed
ambiguous (especially in the negative)
not consistent or dependable
subject to change