Ludicrous means so silly that it deserves to be laughed at. A claim, a price, a hat.
The word is stronger than silly and funnier than absurd, and it carries real scorn: calling a suggestion ludicrous is refusing to take it seriously at all. It attaches happily to amounts, so ludicrous prices and a ludicrous amount of money are common. The Latin root is ludere, to play, which also gives English ludo and the word illusion. The adverb ludicrously usually props up an adjective, as in ludicrously expensive.
1adjectiveludicrousSo foolish or unreasonable that it invites laughter.
“The whole plan was ludicrous from the start.”
Also accepted in games: absurd, ridiculous
Latin
lūdicrus
English, today
ludicrous
Learned borrowing from Latin lūdicrus.
Etymology from Wiktionary, CC BY-SA