Be unsure of synonyms

What is another word for Be unsure of?

• have doubts about
• doubt
• be unsure about
• distrust
• mistrust
• be suspicious of
• be wary of
• be chary of
• be leery of
• regard with suspicion
• suspect
• be skeptical of
• have misgivings about
• wonder about
• disbelieve
• be sceptical of
• be unconvinced about
• take with a grain of salt
• take with a pinch of salt