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Learn to pronounce sil·ly

/ˈsilē/
adjective
having or showing a lack of common sense or judgment; absurd and foolish.
"another of his silly jokes"
synonyms: foolish, stupid, unintelligent, idiotic, brainless, mindless, witless, imbecilic, imbecile, doltish, imprudent, thoughtless, rash, reckless, foolhardy, irresponsible, mad, erratic, unstable, scatterbrained, featherbrained, flighty, frivolous, giddy, fatuous, inane, immature, childish, puerile, half-baked, empty-headed, halfwitted, slow-witted, weak-minded, crazy, loopy, screwy, soft, brain-dead, cretinous, thick, thickheaded, birdbrained, peabrained, pinheaded, dopey, dim, dimwitted, dippy, pie-faced, fat-headed, blockheaded, boneheaded, lamebrained, chuckleheaded, dunderheaded, wooden-headed, muttonheaded, damfool, daft, dotty, scatty, divvy, dappy, glaikit, dumb-ass, chowderheaded, dof, dotish, tomfool, unwise, senseless, inadvisable, injudicious, ill-considered, misguided, inappropriate, illogical, irrational, unreasonable, harebrained, absurd, ridiculous, ludicrous, laughable, risible, farcical, preposterous, asinine

noun
a foolish person (often used as a form of address).
"come on, silly"
synonyms: nincompoop, dunce, simpleton, nitwit, ninny, dimwit, dope, dumbo, dummy, chump, goon, jackass, fathead, bonehead, chucklehead, knucklehead, lamebrain, clod, peabrain, pudding-head, thickhead, wooden-head, pinhead, airhead, birdbrain, scatterbrain, noodle, donkey, silly billy, stupe, nit, clot, twit, berk, twerp, nyaff, sumph, gowk, balloon, bozo, boob, schlepper, goofball, goof, goofus, galoot, dumbhead, dumbass, lummox, dip, simp, spud, coot, palooka, poop, yo-yo, dingleberry, drongo, dill, alec, galah, nong, bogan, poon, boofhead, mompara, muttonhead, noddy, clodpole, spoony, mooncalf

People also ask
silly suggests failure to act as a rational being especially by ridiculous behavior. the silly antics of revelers.
Silliness

Silliness

Silliness is defined as engaging in "a ludicrous folly", showing a "lack of good sense or judgment", or "the condition of being frivolous, trivial, or superficial". In television, film, and the circus, portrayals of silliness such as exaggerated,... Wikipedia
embarrassed; afraid that people will laugh at you: I feel silly in this dress. Synonym. foolish.
adjective · lacking in good sense; absurd · frivolous, trivial, or superficial · feeble-minded · dazed, as from a blow · obsolete. homely or humble ...
/ˈsɪli/ · adjective. ludicrous, foolish. “a silly idea” · adjective. inspiring scornful pity · adjective. lacking seriousness; given to frivolity · adjective.
silly in British English · 1. lacking in good sense; absurd · 2. frivolous, trivial, or superficial · 3. dazed, as from a blow · 4. obsolete. homely or humble.
SILLY meaning: 1 : having or showing a lack of thought, understanding, or good judgment foolish or stupid; 2 : not practical or sensible.
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† Of a person or a person's character, speech, actions, etc.: simple, rustic; lacking sophistication or refinement; (hence) ignorant, uneducated. Obsolete.
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silly. Definition for silly. adjective as in absurd, giddy, foolish. Compare ... silly and senseless behavior; a perfectly silly statement. Inane applies to ...