Nouns

(n)rebuff, slighta deliberate discourteous act (usually as an expression of anger or disapproval)
(n)rebuff, snub, repulsean instance of driving away or warding off

Verbs

(v)rebuff, snub, repelreject outright and bluntly“She snubbed his proposal”
(v)repel, repulse, fight off, rebuff, drive backforce or drive back“repel the attacker”, “fight off the onslaught”, “rebuff the attack”