| whack | (noun) the act of hitting vigorously | Synonyms: belt, knock, rap, whang |
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| (noun) the sound made by a sharp swift blow | - |
| (verb) strike hard | Synonyms: wallop, wham, whop |
| whacked | (adjective) (British informal) exhausted or worn out | - |
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| whacker | (noun) something especially big or impressive of its kind | Synonyms: whopper |
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| whacking | (adjective) (British informal) enormous | - |
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| (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, drubbing, lacing, licking, thrashing, trouncing |
| (adverb) to an abnormal extent | - |
| whacko | (noun) a person who is regarded as eccentric or mad | Synonyms: nutter, wacko |
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| whacky | (adjective) ludicrous, foolish | Synonyms: goofy, silly, wacky, zany |
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| (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky |