crackpot

n.
An eccentric person, especially one with bizarre ideas.

adj.
Foolish; harebrained: a crackpot notion.

[CRACK(ED) + POT¹, skull (obsolete).]

noun

A person regarded as strange, eccentric, or crazy: crazy, eccentric, lunatic. Informal crank, loon, loony. Slang cuckoo, ding-a-ling, dingbat, kook, nut, screwball, weirdie, weirdo. See wise/foolish.

Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: a whimsically eccentric person
  Synonyms: crank, nut, nut case, nutcase, fruitcake, screwball

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Dansk (Danish)
n. - skør person, excentriker
adj. - skør, upraktisabel

Nederlands (Dutch)
onrealistisch, zonderling

Français (French)
n. - cinglé, loufoque, excentrique, fanatique, irréaliste
adj. - cinglé, excentrique, loufoque, irréaliste, fanatique

Deutsch (German)
n. - Spinner
adj. - irre

Ελληνική (Greek)
n. - (καθομ.) μουρλός, βλαμμένος
adj. - παλαβιάρικος

Italiano (Italian)
picchiatello, singolare, bizzarro, originale, strano, strambo, pazzo

Português (Portuguese)
n., -
adj. - pessoa (f) não realista, excêntrico
adj. - impraticável

Русский (Russian)
шизик, сумасшедший

Español (Spanish)
n. - chiflado, chalado
adj. - chiflado, chalado, extraño, estrafalario

Svenska (Swedish)
n. - knäppskalle
adj. - knäpp, vansinnig

中文（简体）(Chinese (Simplified))
疯子, 狂想家, 怪人, 想入非非的, 不切实的

中文（繁體）(Chinese (Traditional))
n. - 瘋子, 狂想家, 怪人
adj. - 想入非非的, 不切實的

한국어 (Korean)
n. - 정신이 돈 사람
adj. - 정신이 돈

日本語 (Japanese)
n. - 変人, 頭が変な人
adj. - 気違いじみた

العربيه (Arabic)
‏(الاسم) مجنون, معتوه, شاذ (صفه) جنونيه‏

עברית (Hebrew)
n. - ‮אדם מוזר בהליכותיו, לא מציאותי, או קנאי‬
adj. - ‮מטורף, בלתי-ניתן לביצוע‬

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