不平|ふへいfuhei[0]heiban (flat)

1. no-adjective, na-adjectivediscontent; dissatisfaction; complaint; grievance
   君きみはいつも不平ふへいを言いっている。↗

   You are always complaining.

• Synonym不服ふふくNeutralDiscontent over refusing to accept something, as in 「判決に不服を申し立てる」; it carries a sense of protest and often marks formal objections.
• Synonym不満足ふまんぞくWrittenWritten word for falling short of satisfaction—expectations unmet; 「不平」 stresses feeling aggrieved inside.
• SynonymクレームNeutralLoanword for customer complaints and claims for compensation (「クレームをつける」); used mostly in business.
• Synonym苦情くじょうNeutralComplaints raised because you have suffered harm or nuisance (「騒音の苦情」); usually directed at neighbors or businesses.
• Synonym文句もんくNeutralThe most common word in speech for complaints or objections (「文句を言う」); can also mean wording or phrasing.
• RelatedクレームNeutralLoanword for customer complaints and claims for compensation (「クレームをつける」); used mostly in business.
• Related恨みうらみNeutralResentment or a grudge (「恨みを晴らす」), aimed at people, organizations, or things; deeper than 「不平」 and tinged with lasting rancor.
• Related慨嘆がいたんWrittenWritten word for grieving, indignant lament, whether over the times or one's own lot (「世の乱れを慨嘆する」); the stress is on sorrow and indignation.
• Related恨み言うらみごとNeutralA grudge voiced—words of resentment (「恨み言を言う」), tinged with rancor.
• RelatedぼやきCasualColloquial: grumbling under one's breath (「上司のぼやき」), with a resigned, helpless undertone.
• Related怨言えんげんWrittenWritten word for words of resentment; rarely used.
• Antonym満足まんぞくNeutralSatisfaction or contentment; the direct opposite of 「不平」.
• Antonym感謝かんしゃNeutralGratitude or thanks; the opposite of the complaining that 「不平」 expresses.

Feeling discontent and airing it is 「不平」 (「不平を言う」); in casual speech 「文句」 is the everyday word. 「苦情」 for complaints over harm suffered, 「クレーム」 for customer claims, 「不服」 for formal objections, 「恨み」 for grudges. The opposite is 「満足」.

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

1. 不満ふまん。満足まんぞくできないで心こころが平たいらでない様さま。
2. 不満ふまんを感かんじていることを表明ひょうめいすること。