1. Broadly or extravagantly humorous; resembling farce
   "ludicrous green hair"
   - farcical, ridiculous 
2. Incongruous; inviting ridicule
   "it is ludicrous to call a cottage a mansion"
   - absurd, cockeyed, derisory, idiotic, laughable, nonsensical, preposterous, ridiculous

See also: foolish, humorous, humourous [Brit, Cdn, non-standard], ludicrously

Encyclopedia: Ludicrous

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