lacking or indicating lack of confidence or assurance
"uncertain of his convictions"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers"
同义词：
unsure
incertain
not established beyond doubt; still undecided or unknown
"an uncertain future"; "a manuscript of uncertain origin"; "plans are still uncertain"; "changes of great if uncertain consequences"; "without further evidence his story must remain uncertain"
not established or confirmed
同义词：
unsealed
not certain to occur; not inevitable
"everything is uncertain about the army"; "the issue is uncertain"
subject to change
"the weather is uncertain"
同义词：
changeable
unsettled
not consistent or dependable
"an uncertain recollection of events"; "a gun with a rather uncertain trigger"
ambiguous (especially in the negative)
"she spoke in no uncertain terms"