1. extremely wicked, deeply criminal - a flagitious crime - heinous accusations • Syn: heinous • Similar to: wicked • Derivationally related forms: heinousness (for: heinous) 2. shockingly brutal or cruel - murder is an atrocious crime - a grievous offense against morality - a grievous crime - no excess was too monstrous for them to commit • Syn: atrocious, grievous, monstrous • Similar to: evil • Derivationally related forms: monster (for: monstrous), monstrosity (for: monstrous), atrocity (for: atrocious), atrociousness (for: atrocious)