1. They deliberately gave me a skittish and mordacious mount.

2. Since you already solved the clue Bitingly sarcastic which had the answer MORDACIOUS, you can simply go back at the main post to check the other daily crossword clues

3. Barbed - capable of wounding; "a Barbed compliment"; "a biting aphorism"; "pungent satire" biting , mordacious , nipping , pungent sarcastic - expressing or expressive of ridicule that wounds

4. Acerbic adjective sharp, cutting, biting, severe, acid, bitter, nasty, harsh, stern, rude, scathing, acrimonious, barbed, unkind, unfriendly, sarcastic, sardonic, caustic, churlish, vitriolic, trenchant, acrid, brusque, rancorous, mordant, mordacious comments made in a spirit of Acerbic wit

5. Acerbic adjective sharp, cutting, biting, severe, acid, bitter, nasty, harsh, stern, rude, scathing, acrimonious, barbed, unkind, unfriendly, sarcastic, sardonic, caustic, churlish, vitriolic, trenchant, acrid, brusque, rancorous, mordant, mordacious comments made in a spirit of Acerbic wit