uncertain

Not established or confirmed.

Subject to change.

“the weather is uncertain”

Lacking or indicating lack of confidence or assurance.

“uncertain of his convictions”

“moving with uncertain (or unsure) steps”

Ambiguous (especially in the negative).

“she spoke in no uncertain terms”

Not certain to occur; not inevitable.

“everything is uncertain about the army”

“the issue is uncertain”

Not consistent or dependable.

“an uncertain recollection of events”

“a gun with a rather uncertain trigger”

Not established beyond doubt; still undecided or unknown.

“an uncertain future”

“a manuscript of uncertain origin”