spastic Get Printable Handwriting (spas-tic) 2 syllables Learn It! Spelling Test Definition adjective. pertaining to of the nature of or characterized by spasm especially tonic spasm.noun. a person exhibiting such spasms Example Sentence Claire has spastic movements because of her cerebral palsy. Synonyms sudden muscular contraction; twitch; jerk; cramp Antonyms calm; still Share with your friends: