uncertain

not established or confirmed

subject to change

“the weather is uncertain”

lacking or indicating lack of confidence or assurance

“uncertain of his convictions”

ambiguous (especially in the negative)

“she spoke in no uncertain terms”

not certain to occur; not inevitable

“everything is uncertain about the army”

not consistent or dependable

“an uncertain recollection of events”

not established beyond doubt; still undecided or unknown

“an uncertain future”