uncertain

adjectives

lacking or indicating lack of confidence or assurance
"uncertain of his convictions"; "unsure of himself and his future"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers"
incertain, uncertain, unsure
is derived from
uncertainness
antonym
certain
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"
uncertain
is derived from
uncertainness
antonym
certain
is similar to
not decided or not known
"were indefinite about their plans"; "plans are indefinite"
indefinite
is similar to
very uncertain
"left everything up in the air"
up in the air
see also
not precisely determined or established; not fixed or known in advance
"of indeterminate age"; "a zillion is a large indeterminate number"; "an indeterminate point of law"; "the influence of environment is indeterminate"; "an indeterminate future"
indeterminate, undetermined
is an attribute of
something that is certain
"his victory is a certainty"
certainty, foregone conclusion, sure thing
not established or confirmed
"his doom is as yet unsealed"
uncertain, unsealed
is derived from
uncertainness
not certain to occur; not inevitable
"everything is uncertain about the army"; "the issue is uncertain"
uncertain
is derived from
uncertainness
antonym
certain
is similar to
subject to accident or chance or change
"a chancy appeal at best"; "getting that job was definitely fluky"; "a fluky wind"; "an iffy proposition"
chancy, flukey, fluky, iffy
is similar to
uncertain because of uncontrollable circumstances
"the results of confession were not contingent, they were certain"- George Eliot
contingent
is similar to
not yet determined
"plans are still up in the air"
up in the air
see also
not capable of being foretold
unpredictable
subject to change
"a changeable climate"; "the weather is uncertain"; "unsettled weather with rain and hail and sunshine coming one right after the other"
changeable, uncertain, unsettled
not consistent or dependable
"an uncertain recollection of events"; "a gun with a rather uncertain trigger"
uncertain
is derived from
uncertainness
is similar to
not worthy of reliance or trust
"in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"
undependable, unreliable
ambiguous (especially in the negative)
"she spoke in no uncertain terms"
uncertain
is similar to
having more than one possible meaning
"ambiguous words"; "frustrated by ambiguous instructions, the parents were unable to assemble the toy"
ambiguous