How to say "rash" in Japanese

• 無謀むぼうCommon
  na-adjective, nounCovers 'rash' in the sense of reckless and foolhardy: an ill-advised plan or undertaking that ignores the dangers. It condemns the venture itself as reckless rather than merely hasty.
• 軽率けいそつJLPT N1approx.Common
  na-adjective, nounCovers 'rash' meaning hasty and thoughtless: a decision, remark, or action taken without thinking things through. It criticizes the haste and lack of thought rather than recklessness.
  あの連中れんちゅうは軽率けいそつで、仕事しごとがのろかったから、くびになった。↗

  They got the sack for being careless and tardy.
• かぶれCommon
  nounCovers the skin sense: a rash or eruption that appears in response to a skin irritant. It is usually written in kana alone rather than with kanji.
• 軽々しいかるがるしいCommon
  i-adjectiveAn adjective describing rash, imprudent behavior or remarks — thoughtless and careless. Its meaning is close to 軽率's, and both criticize acting or speaking without due care.
  この問題もんだいは軽々かるがるしく扱あつかってはならない。↗

  This matter must not be trifled with.
• 湿疹しっしんCommon
  nounCovers 'rash' as a skin condition, especially eczema. For a rash that breaks out in reaction to an irritant, かぶれ is the closer word.
  肛門こうもんのまわりに湿疹しっしんがあります。↗

  I have a rash around my anus.

For rash behavior choose 軽率 or 無謀 for hasty or reckless decisions, 「軽々しい」 for imprudent conduct; for a skin rash choose 「かぶれ」 for an irritant reaction and 湿疹 for eczema.

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

• 無謀むぼうreckless
• 軽率けいそつrash
• かぶれrash
• 軽々しいかるがるしいrash
• 湿疹しっしんeczema
• 性急せいきゅうhasty
• 早計そうけいoverhasty
• 軽はずみかるはずみthoughtless
• 吹き出物ふきでもの(skin) eruption
• 滅多めったthoughtless
• せっかちhasty
• そそっかしいcareless
• むやみthoughtless
• 疹しんrash
• 発疹ほっしんrash
• 無鉄砲むてっぽうrash
• 出物でものrash
• 皮疹ひしんrash
• むやみやたらthoughtless
• 粗忽そこつcareless
• 向こう見ずむこうみずreckless
• 無考えむかんがえthoughtless
• 気が早いきがはやいhasty
• 気の早いきのはやいhasty
• できものtumour
• 無茶むちゃrash
• めちゃめちゃabsurd
• ぶつぶつpimples
• 安やすrash
• 尻軽しりがるrash
• 気短きみじかimpatient
• 尻が軽いしりがかるいcareless
• ぼつぼつspots