1. (adj) grim, inexorable, relentless, stern, unappeasable, unforgiving, unrelenting
not to be placated or appeased or moved by entreaty
Synonyms: down(p), dispirited, downcast, intransigent, brutal, exacting, severe, forbidding, persistent, austere, dismal, dark, sick, disconsolate, black, grisly, low, unrelenting, down in the mouth, stern, blue, unappeasable, gruesome, macabre, downhearted, grim, mordant, stark, dour, adamantine, strict, relentless, unforgiving, sorry, gloomy, drab, ghastly, depressed, dingy, inexorable, dreary, drear, low-spirited, adamant
Antonyms: placable, sporadic
2. (adj) persistent, relentless, unrelenting
never-ceasing
Synonyms: unappeasable, inexorable, lasting, persistent, unrelenting, tenacious, relentless, dour, haunting, stern, unyielding, grim, dogged, unforgiving, brutal, pertinacious
Antonyms: sporadic, placable
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Synonyms and Antonyms of relentless 
