不愉快|ふゆかいfuyukai[2]nakadaka (mid-high)

1. na-adjective, noununpleasant; disagreeable; displeasing; uncomfortable; unhappy
   私は非常ひじょうに不愉快ふゆかいだ。↗

   I'm really unhappy about this.

• Synonym不快ふかいWrittenMore written and formal than 「不愉快」; also covers feeling physically unwell, as in 「ご不快」.
• SynonymいやらしいNeutralUnpleasant or nasty, and often lewd; stresses sleazy or mean-spirited attitudes and behavior.
• Synonym苦々しいにがにがしいWrittenWritten and formal; strong displeasure and distaste tinged with resentment, as in 「苦々しく思う」.
• Synonym胸糞が悪いむなくそがわるいCasualAn idiom for something so sickening it turns your stomach; coarse colloquial speech with an extremely strong sense of disgust.
• RelatedうっとうしいNeutralGloomy, depressing and irritating; stresses dreary weather or persistent pestering, as in 「鬱陶しい梅雨」.
• Related忌まわしいいまわしいWrittenWritten and formal; abhorrent, even ominous, stressing a chilling, shudder-inducing disgust, as in 「忌まわしい事件」.
• Related憎らしいにくらしいNeutralHateful, detestable; stresses loathing of a person, and can also be used ironically to mean adorable.
• Related煩わしいわずらわしいNeutralTroublesome and bothersome; stresses complicated, fiddly matters that tax your mind, as in 「煩わしい手続き」.
• RelatedウザイCasualSlang for someone annoying or an unwanted presence; young people's speech, and rather harsh in tone.
• RelatedキモイCasualSlang for gross or creepy; works for physical disgust or off-putting behavior; young people's speech.
• Related忌々しいいまいましいNeutralFor something hateful that riles you up; stresses vexation and anger, as in 「忌々しい雨」.
• Related厭わしいいとわしいWrittenWritten and formal; detestable in a way that makes you recoil, stressing the instinctive urge to avoid it.
• Related憎々しいにくにくしいNeutralHateful, detestable; stresses loathing stirred by a person's attitude or expression.
• Related疎ましいうとましいWrittenWritten and formal; disagreeable in a way that makes you want to keep your distance.
• Related苛立たしいいらだたしいWrittenWritten and formal; irritating and frustrating, stressing the impatient, restless feeling when things will not go your way.
• Relatedいけ好かないいけすかないCasualColloquial for finding someone off-putting or unlikeable; stresses a gut-level aversion to a person.
• Related憎たらしいにくたらしいCasualColloquial way to call someone hateful or detestable; stronger than 「憎らしい」.
• RelatedうざったいCasualSlang for something bothersome or irritating that tries your patience, whether a person, task or situation; close to 「ウザイ」, with strength depending on context.
• Antonym愉快ゆかいNeutralThe direct opposite of 「不愉快」: pleasant, enjoyable, delightful.
• Antonym快適かいてきNeutralComfortable and agreeable; the opposite of 「不愉快」 in the sense of physical discomfort.
• Antonym楽しいたのしいNeutralFun and enjoyable; the most common everyday word, the opposite of 「不愉快」.

Use 「不愉快」 as the default for anything that leaves you feeling unpleasant or put out, as in 「不愉快な思いをする」. In written or formal prose prefer 「不快」. Turn to 「鬱陶しい」 for gloomy weather or someone pestering you, and 「煩わしい」 for fiddly, bothersome matters. In casual speech, 「ウザイ」 and 「キモイ」 are the slangy picks. The opposites are 「愉快」 and 「楽しい」.

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

1. 楽たのしくないこと。愉快ゆかいでないこと。気分きぶんが悪わるいこと。