無茶|むちゃmucha[1]atamadaka (head-high)

1. na-adjective, nounabsurd; unreasonable; ridiculousむっちゃ is dialectal
   君きみがそれをたった一人ひとりでやろうなんてむちゃだ。↗

   You are mad to try to do it all alone.
2. na-adjective, nounrash; reckless
   冬ふゆにその山やまに登のぼるなんて彼かれは無茶むちゃだ。↗

   He'd be crazy to climb the mountain in winter.
3. na-adjective, nounexcessive; immoderate; extreme
   無茶むちゃしなければよかった。↗

   I shouldn't have overdone it.
4. adverbvery; extremely; excessively

• SynonymめちゃくちゃCasualCommon in speech for chaos or utter nonsense, also an adverbial intensifier meaning 'extremely'; 「無茶」 focuses on acting unreasonably or beyond limits.
• SynonymむちゃくちゃCasualAn intensified form of 「無茶」 with a heavier tone, also usable adverbially to mean 'extremely'; plain 「無茶」 is more common in warnings like 「無茶するな」.
• Synonym不合理ふごうりWrittenWritten/formal prose for what defies reason or logic, said of systems and demands; 「無茶」 is more colloquial and describes wild behaviour.
• Synonym理不尽りふじんNeutralFor high-handed unfairness, as in 「理不尽な要求」 or 「理不尽な扱い」; 「無茶」 can also mean pushing yourself too hard.
• Synonym荒唐無稽こうとうむけいWrittenA written four-character compound for baseless, fantastic claims or stories; 「無茶」 applies to actions and demands.
• Synonym馬鹿らしいばからしいNeutralFor something foolish and not worth doing, with a dismissive tone; 「無茶」 is about unreasonable or overdone behaviour.
• Synonym不条理ふじょうりWrittenWritten/formal prose for what defies reason, often about society, fate or as a literary concept; 「無茶」 is more colloquial, for actions, demands, prices and the like.
• Synonym無謀むぼうNeutralFor reckless ventures with no thought of consequences, as in 「無謀な計画」; close to 「無茶」 but more written/formal, stressing lack of planning.
• SynonymとてつもないNeutralFor something outrageous or astonishingly large, often scales or ideas as in 「途轍もない計画」; 「無茶」 targets reckless, unreasonable behaviour.
• SynonymばかばかしいNeutralFor something so silly it is beneath mention, carrying contempt; 「無茶」 is about acting unreasonably or overdoing things.
• Synonym阿呆らしいあほらしいCasualColloquial with a Kansai flavour, for something foolish and not worth taking seriously; 「無茶」 covers reckless, excessive behaviour.
• Synonym馬鹿げたばかげたNeutralA prenominal form for absurd, foolish things, as in 「馬鹿げた話」; 「無茶」 stresses wild, reckless doing.
• SynonymバカくさいCasualColloquial for something so silly it saps your motivation; 「無茶」 refers to reckless, excessive acts.
• SynonymアホくさいCasualKansai colloquialism for something too stupid to bother with; 「無茶」 means unreasonable, wild behaviour.
• RelatedでたらめCasualFor talking nonsense or acting at random, stressing irresponsibility; 「無茶」 stresses overexertion and excess.
• RelatedめちゃめちゃCasualColloquial for a mess or something wrecked, also an intensifier meaning 'very'; 「無茶」 focuses on unreasonable, excessive behaviour.
• Related過度かどWrittenWritten/formal prose for exceeding a proper degree, as in 「過度な運動」; 「無茶」 is colloquial and adds a sense of unreasonableness and recklessness.
• Related筋違いすじちがいNeutralFor what is illogical or beside the point, as in 「筋違いの要求」, and also a strained muscle; 「無茶」 stresses forcing things recklessly.
• Related並み外れなみはずれNeutralFor far above the average, usually positive, as in 「並み外れた才能」; 「無茶」 is negative, implying wild excess.
• Related無理むりNeutralThe broadest term for the impossible, the unreasonable or straining oneself; 「無茶」 is stronger, stressing wild excess.
• Related極端きょくたんNeutralFor leaning to one extreme, as in 「極端な意見」; 「無茶」 stresses acting wildly or to excess.
• Related大胆だいたんNeutralBold and daring, usually a compliment; 「無茶」 is the pejorative, reckless version.
• Related過重かじゅうWrittenWritten/formal prose for burdens or workloads that are too heavy; 「無茶」 is more colloquial and covers unreasonableness and excess generally.
• Related向こう見ずむこうみずNeutralFor a reckless character or acts done without thought of consequences; close to 「無茶」's reckless sense, but 「無茶」 also covers unreasonable demands.
• Antonym分別ふんべつNeutralAntonym: good sense and knowing where to draw the line, the opposite of 「無茶」's disregard for limits.
• Antonym慎重しんちょうNeutralAntonym: careful and cautious, never acting rashly — the opposite of 「無茶」's recklessness.

Use 「無茶」 to tell someone not to overdo it or push themselves too hard, as in 「無茶するな」; for emphasis use 「無茶苦茶」. For recklessness with no thought of the consequences pick 「無謀」 or 「向こう見ず」; for unreasonable, unfair demands 「理不尽」; for absurd, laughable things 「馬鹿馬鹿しい」. 「無理」 is the broad everyday word for the impossible or for straining oneself, while 「滅茶苦茶」 and 「目茶目茶」 cover chaos and the adverbial 'extremely'. In writing prefer 「不合理」, 「不条理」, 「過度」, 「過重」 or 「荒唐無稽」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 筋道すじみちが立たたないこと。
2. 乱暴らんぼうなこと。節度せつどのないこと。
3. 過度かどであること。