愚ぐ痴ち

文もん句くN3sense 1
文句 is a direct complaint or objection, often stronger and more confrontational, while 愚痴 is more like idle grumbling or venting.
不ふ満まんN3sense 1
不満 is the general feeling of dissatisfaction itself, while 愚痴 is the act of voicing petty complaints about it.
苦く情じょうN3sense 1
苦情 is a formal complaint typically made to a company or authority, whereas 愚痴 is casual grumbling to a sympathetic listener.
ぶつぶつN3
愚痴 is the common word for grumbling or complaining about one's troubles, while ぶつぶつ describes the low, mumbling sound of such complaints.

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弱よわ音ねN1
愚痴 is grumbling about a situation or other people, while 弱音 specifically expresses one's own weakness or lack of confidence.
小こ言ごと
愚痴 is grumbling about one's own troubles or misfortune, while 小言 is fault-finding directed at someone else's behavior.
不ふ平へいN3
愚痴 is aimless, repetitive grumbling to vent feelings, while 不平 refers to a specific point of dissatisfaction or grievance.

Don't confuse with

愚ぐ
愚 means foolishness or a foolish act, while 愚痴 means a complaint or grumbling, despite sharing the same first kanji.

愚ぐ痴ちUsage78%
Standard kanji spelling for everyday complaints and grumbling.
グチUsage16%
kana-only spelling
Katakana spelling sometimes used for emphasis or in casual writing.
ぐちUsage6%
愚ぐ癡ち
out-dated kanji form
Outdated kanji form; 癡 is an old variant of 痴.

From Buddhist terminology meaning 'ignorance' or 'delusion', later extended to mean 'foolish talk' and then 'idle complaint' in everyday language.