I am unsure

Examples

I am unsure if I locked the front door before leaving the house.

I am unsure about the requirements for this project, so I will ask my manager for clarification.

I am unsure whether we should take the train or drive to the city tomorrow.

Synonyms

I am doubtful I am hesitant I am indecisive I am uncertain I am ambivalent I am wavering I am skeptical

Antonyms

I am certain I am sure I am confident I am convinced I am positive I am resolute I am decisive