you better believe it
- absolutelyCompletely, without exception
- definitelyWith complete certainty
- damn rightEmphatic affirmation of correctness
- no doubtCertainly, very probably
- trust meAppeal for confidence
for sure · count on it · bet on it · without question · certainly · positively · guaranteed · undoubtedly · hell yeah · sure thing · conviction · emphatic · confident · assertive · nod · affirmation · promise · swear
certainty and affirmation
you better believe itno way
Emphatic denial
fat chance · not a chance · I doubt it · think again · in your dreams