uncertain

Synonyms: ambiguous ambivalent chancy conjectural dubious erratic fitful hanging by a thread hazy hesitant iffy incalculable inconstant indefinite indeterminate indistinct insecure irregular irresolute on thin ice precarious questionable risky speculative touch and go unclear unconfirmed undecided undetermined unfixed unforeseeable unpredictable unreliable unresolved unsettled unsure up for grabs up in the air vacillating vague variable wavering

Antonyms: certain clear definite determined foreseeable secure sure unchanging