fearsome

1 causing fear at night the child would always imagine that there were fearsome monsters lurking under his bed Synonyms alarming, dire, direful, dread, dreadful, fearful, forbidding, formidable, frightening, frightful, ghastly, hair-raising, horrendous, horrible, horrifying, intimidating, redoubtable, scary, shocking, spine-chilling, terrible, terrifyingRelated Words daunting, demoralizing, disconcerting, discouraging, dismaying, disquieting, distressing, disturbing, perturbing, startling, threatening, troubling, trying, unnerving; bone-chilling, creepy, eerie (also eery), weird; appalling, atrocious, awful, grisly, gruesome (also grewsome), hideous, horrid, macabre, monstrous, nightmarishNear Antonyms calming, comforting, consoling, inviting, lulling, pacifying, quieting, reassuring, relaxing, soothing, tranquilizing (also tranquillizing); nonintimidating, nonthreatening

2 extreme in degree, power, or effect after working all afternoon in the hot sun, I had developed a fearsome thirst Synonyms acute, almighty, blistering, deep, dreadful, excruciating, explosive, exquisite, fearful, intense, ferocious, fierce, frightful, furious, ghastly, hard, heavy, heavy-duty, hellacious, intensive, keen, profound, terrible, vehement, vicious, violentRelated Words accentuated, aggravated, concentrated, deepened; emphasized, enhanced, heightened, intensified, magnified; stressed; exhaustive, thorough; harsh, rigorous, severeNear Antonyms feeble, weak; shallow, superficial; moderated, qualified; alleviated, eased, lightened, toned (down); abated, decreased, diminished, lessened, reduced, subduedAntonyms light, moderate, soft

3 easily frightened the more fearsome of the two children would only peer at the guests from a distance Synonyms fainthearted, fearful, shy, mousy (or mousey), scary, skittish, timid, timorous, tremulousRelated Words chicken, chickenhearted, chicken-livered, cowardly, craven, dastardly, gutless, lily-livered, milk-livered [archaic], poltroon, pusillanimous, spineless, unheroic, yellow; jittery, jumpy, spooky; anxious, apprehensive, nervous; afraid, alarmed, horrified, panicked, panicky, panic-stricken, scared, shocked, spooked, startled, terrified, terrorized, unnervedNear Antonyms brave, courageous, dauntless, doughty, fearless, gallant, greathearted, heroic (also heroical), intrepid, lionhearted, stalwart, stout, stouthearted, undaunted, valiant, valorous; assured, confident, self-assured, self-confident; determined, firm, game, plucky, resolute, undeterred, unflinching, unswerving; mettlesome, spirited, spunkyAntonyms adventuresome, adventurous, audacious, bold, daring, dashing, gutsy, hardy, venturesome, venturous