köken: Uncertain. Perhaps a Lombardic or Carolingian era borrowing from Old High German barrezzen (“to hate”) or maybe from French page (“page, serving boy”), probably via Neapolitan pazzo (compare French adage “être effronté comme un page”). Alternatively from Latin patiēns (“suffering”). Compare Sicilian pacciu.
köken: From Middle Dutch geck (“madman”). Earlier origin uncertain, but perhaps from an imitative verb also found in Swedish gäcka (“to mock”). Cognate with German Geck, Jeck, English geek (see etymology there).
aile: gek als een deur, gek als een ui, gekke Henkie, gekkerd, gekkig, gekmakend, gekscheren, knettergek, stapelgek
köken: From Byzantine Greek τρελός (trelós), from Koine Greek τρηρός (trērós), from Ancient Greek τρήρων (trḗrōn). The chess sense is a semantic loan from French fou.
madman, lunatic · madness, insanity · enthusiast, fan
eş: 狂人, きじるし, ばか, マニア, フリーク
köken: Verbal noun of 気(き)が違(ちが)う (ki ga chigau, “to be mad”). Analyzable as 気(き) (ki, “mind, temperament, character; mood, spirit”) + 違(ちが)い (chigai, “difference; mistake”, 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 違(ちが)う (chigau, “to differ; to be mistaken”)).
köken: From ne- (“not”) + bun (“sane”). The sense “bishop (chess piece)” is a semantic loan from French fou, from Spanish alfil, from Arabic الفيل (al-fīl, “elephant, chess bishop”).
çekim: karşılaştırma bolondabb · üstünlük legbolondabb
köken: Borrowed from a Slavic language. Compare Polish błąd (“mistake”), Russian блуд (blud, “fornication”), from Proto-Slavic *blǫdъ. Compare also unrelated German blöd.
köken: From Middle Irish geilt, gelt, from Proto-Celtic *gʷeltis (“wild”), from Proto-Indo-European *gʷʰel-t-, whence perhaps also English wild. Cognate with Welsh gwyllt (“wild”).
köken: From Proto-Malayo-Polynesian *baliw (“return”), from Proto-Austronesian *baliw (“return”). Compare Central Bikol baliw, Cebuano baliw, and Maranao baloy. Doublet of ibayo.