でたらめ・出鱈目detarame[0]heiban (flat)

1. noun, na-adjectivenonsense; irresponsible remark; codswallop; hogwash; rubbish
   彼かれはでたらめな約束やくそくをして彼女かのじょを誘惑ゆうわくした。↗

   He seduced her with false promises.
2. na-adjective, nounrandom; haphazard; unsystematic
   彼かれは本棚ほんだなに本ほんをでたらめに入いれた。↗

   He put the books on the shelf out of order.

• Synonymいい加減いいかげんNeutralCareless, perfunctory, irresponsible; also 'moderate' or 'considerably'. 「出鱈目」 stresses being groundless and random, and covers both speech and actions.
• SynonymナンセンスNeutralA loanword for the absurd and meaningless; stresses that something does not hold up logically.
• Synonym虚言きょげんWrittenAlso written 「虚言」; same word as the entry above. Besides lies it covers words never backed by action, a sense 「出鱈目」 lacks.
• SynonymむちゃくちゃCasualA total mess with no logic; strong in degree, and also an intensifier meaning 'extremely'. Common in speech.
• SynonymめちゃくちゃCasualUtterly senseless and all mixed up; also an intensifier meaning 'extremely'. Common in speech; basically synonymous with 「無茶苦茶」.
• Synonym空言そらごとWrittenFalse, untrue talk or empty promises never acted on; leans written/formal, stressing lying. 「出鱈目」 stresses making things up and acting wildly.
• Synonym出放題でほうだいNeutralTalking off the cuff, saying whatever you please; stresses the lack of restraint.
• Synonym与太よたCasualSlangy word for idle chatter and nonsense, as in 「与太話」; has a coarse, vulgar flavor.
• Synonym出任せでまかせNeutralA noun for words blurted out without thinking, as in 「口から出任せ」.
• Synonym世迷言よまいごとNeutralMuttered grumbling and complaints; stresses complaining rather than making things up.
• Synonym荒誕こうたんWrittenWritten/formal word for wild, exaggerated talk; rarely used today.
• Synonym無稽むけいWrittenA noun for having no basis at all, mostly seen in 「荒唐無稽」; leans written/formal.
• Synonym虚誕きょたんWrittenWritten/formal word for exaggerated, untrue talk; rarely used today.
• SynonymちゃらんぽらんCasualColloquial for slapdash, devil-may-care conduct; stresses a careless personality.
• Synonym痴れ言しれごとWrittenAn old word for foolish, senseless talk with a literary flavor; rarely used today.
• Related無茶むちゃNeutralReckless, unreasonable behavior, as in 「無茶をする」; stresses going too far in one's actions.
• Related無責任むせきにんNeutralA noun for irresponsibility; stresses the attitude, and does not necessarily imply talking nonsense.
• Related無意味むいみNeutralA noun for what has no meaning at all; stresses worthlessness, while 「出鱈目」 stresses acting wildly.
• Antonym正確せいかくNeutralAccurate and free of error; the opposite of 「出鱈目」 with its made-up, hit-or-miss nature.

Use 「出鱈目」 for groundless nonsense talk or wild, hit-or-miss behavior, as in 「出鱈目を言う」. For careless, perfunctory attitudes pick 「いい加減」, for reckless excess 「無茶」, for talking off the top of your head 「出任せ」, and for a hopeless mess 「めちゃくちゃ」; for accuracy use 「正確」.

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

1. いい加減かげんなこと。また、そのさま。
2. ハルシネーション。