noun / verb
rebuff
rih-BUF/rɪˈbʌf/
A blunt rejection of someone or something.
The woman's cold refusal is a rebuff to the offered handshake.

Etymology
The 'back' and 'puff' components formed an Italian word meaning 'a snub.' The English verb preserves that sense of sharply repelling people or dismissing what they offer.
In context
failing to rebuff key arguments or leaving out things that should be part of their rebuttal
More examples
- The company rebuffs his request for a refund.
- Despite repeated rebuffs, she keeps inviting him to lunch.
- He rebuffed my apology and told me to leave.
Forms
rebuff · rebuffs · rebuffed · rebuffing