When you are unsure about something, there are several synonyms that you can use to express your doubt or uncertainty. Some alternatives to "wast sure about" include "uncertain," "unsure," "doubtful," "hesitant," and "wavering." You can also use expressions like "not quite convinced," "undecided," "ambivalent," and "on the fence." Being "in two minds" or "in a quandary" also accurately conveys a sense of confusion or doubt. Finally, you can say that you are "skeptical," "questioning," or "suspicious" if you harbor doubts about something. Using these synonyms can help you express your feelings more precisely and avoid any misinterpretations.