viciousness Get Printable Handwriting (vi-cious-ness) 3 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. cruel or violent; fierce Example Sentence The teacher did not appreciate the child's viciousness. Synonyms brutal; cruel; evil; fierce; savage; violent Antonyms gentle; kind Hear It! Say It! Write It! viciousness Switch to cursive Start Share with your friends: