doubtful
Translation
doubtful, uncertain, unlikely
Examples
I am doubtful about our chances of winning.
I am doubtful about our chances of winning.
It is doubtful whether the project will be finished on time.
It is doubtful whether the project will be finished on time.
Grammar Patterns
((about sth.)) feeling uncertain about (sth.) I am doubtful about our chances of winning.
((if/whether ...)) unlikely to happen or be true It is doubtful whether the project will be finished on time.
Similar Words
Synonyms: uncertain, unlikely; Antonyms: certain, likely
Etymology
From the word 'doubt' plus the suffix '-ful', meaning 'full of'. Literally 'full of doubt'.
Memory Tips
If something is 'full of doubt', it is 'doubtful'. Easy to remember the connection.