grim /ɡɹɪm/adjective 5noun 3verb 1forms 5 adjective5 •Dismal and gloomy, cold and forbidding.Life was grim in many northern industrial towns. •Ghastly or sinister.A grim castle overshadowed the village. •Rigid and unrelenting.His grim determination enabled him to win. •Disgusting; gross.– Wanna see the dead rat I found in my fridge? – Mate, that is grim! •(no longer used) Fierce, cruel, furious.The LORDE shall be grymme vpon them, and destroye all the goddes in the londe. And all the Iles of the Heithen shal worshipe him, euery man in his place. — 1535 noun3 •(slang, old-fashioned) A promiscuous woman.You got a new girl and she looks choong (Choong) But you didn't know your girl was a grim […] Your girl she's a grim, I wouldn't have no grim as my ting — 2006 •(no longer used) Anger, wrath. •(no longer used) A specter, ghost, haunting spirit. verb1 •(rare) To make grim; to give a stern or forbidding aspect to. formsgrimmed · grimming · grims · grimmer · grimmest