rebuff

(noun) a deliberate discourteous act (usually as an expression of anger or disapproval). Synonyms: slight.

(noun) an instance of driving away or warding off. Synonyms: snub, repulse.

(verb) reject outright and bluntly. Synonyms: snub, repel. Example: "She snubbed his proposal."

(verb) force or drive back. Synonyms: repel, repulse, fight off, drive back. Examples: "Repel the attacker." "Fight off the onslaught." "Rebuff the attack."