terrific adjective3 •extremely goodI say! She's a terrific tennis player. •Very strong or intense; excessive, tremendous.The car came round the bend at a terrific speed.I've got a terrific hangover this morning. •(no longer used) Causing terror; terrifying.[T]he dismal shrieks of demoniac rage […] roused phantoms of horror in her mind, far more terrific than all that dreaming superstition ever drew. — 1798 formsmore terrific · most terrific