noun

1. A terrifying and dangerous creature.

2. A bizarre or whimsical creature.

   “The children decided Grover was a cuddly monster.”

3. A cruel or antisocial person, especially a criminal.

   “Get away from those children, you meatheaded monster!”

verb

1. To make into a monster; to categorise as a monster; to demonise.

2. To behave as a monster to; to terrorise.

3. To harass.

adjective

1. Very large; worthy of a monster.

   “He has a monster appetite.”

2. Great; very good; excellent.

Synonyms: gigantic, monstrous