Adjective

(en-adj)

Dreadful; causing alarm and fear.

Formidable, powerful.

* 1883: (Robert Louis Stevenson), (Treasure Island)

and there was even a party of the younger men who pretended to admire him, calling him a "true sea-dog," and "real old salt," and such-like names, and saying there was the sort of man that made England terrible at sea.

Intense; extreme in degree or extent.

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=18 citation , passage=‘Then the father has a great fight with his terrible conscience,’ said Munday with granite seriousness. ‘Should he make a row with the police […]? Or should he say nothing about it and condone brutality for fear of appearing in the newspapers?}}

Unpleasant; disagreeable.

* , chapter=12

, title= The Mirror and the Lamp , passage=To Edward […] he was terrible , nerve-inflaming, poisonously asphyxiating. He sat rocking himself in the late Mr. Churchill's swing chair, smoking and twaddling.}}

Very bad; lousy.

* {{quote-news, year=2012, date=April 26, author=Tasha Robinson, work=The Onion AV Club

, title= Film: Reviews: The Pirates! Band Of Misfits , passage=The openly ridiculous plot has The Pirate Captain (Hugh Grant) scheming to win the Pirate Of The Year competition, even though he’s a terrible pirate, far outclassed by rivals voiced by Jeremy Piven and Salma Hayek.}}

Adjective

(grimmer)

dismal and gloomy, cold and forbidding

Life was grim in many northern industrial towns.

rigid and unrelenting

His grim determination enabled him to win.

ghastly or sinister

A grim castle overshadowed the village.

* 2012 March 22, Scott Tobias, “ The Hunger Games''”, in ''AV Club :

In movie terms, it suggests Paul Verhoeven in Robocop/Starship Troopers mode, an R-rated bloodbath where the grim spectacle of children murdering each other on television is bread-and-circuses for the age of reality TV, enforced by a totalitarian regime to keep the masses at bay.

(UK, slang) disgusting; gross

Wanna see the dead rat I found in my fridge? —Mate, that is grim !