certain
All of her teachers felt certain that she would go on to have a successful career.
She felt certain she had followed the correct procedure.
My father, I feel certain, would have approved of this decision.
This case will be solved — everyone on the team feels certain of that.
SMART Vocabulary: related words and phrases Certainty
(as) clear as dayidiom
(as) sure as eggs is eggsidiom
and that's flat!idiom
assure someone of something
assured
decidedly
deffo
definite
definitely
definitive
ironclad
irrefutable
irrefutably
make no mistake (about it)idiom
mistake
unreserved
unreservedly
watertight
would
you can bet your lifeidiom
You can also find related words, phrases, and synonyms in the topics:
Confidence & self-assurance