突如|とつじょtotsujo[1]atamadaka (head-high)

1. adverb (with と), taru-adjectivesuddenly; all of a sudden; unexpectedly
   トムの怒いかりは突如とつじょ燃え上もえあがった。↗

   Tom's anger blazed out suddenly.

• Synonym突然とつぜんNeutralThe most general word for suddenness. 「突如」 is more literary and stronger in tone, common in news and fiction; both work with appearances, events and changes.
• SynonymにわかにWrittenWritten/formal prose. Suddenness, as in 「にわかに雨が降る」; 「突如」 puts more weight on being caught off guard.
• Synonym不意にふいにNeutralNeutral. For catching someone off guard, unexpectedly. 「突如」 is more literary and stresses that things happen beyond expectation, with no warning.
• Synonym急にきゅうにNeutralNeutral and common in speech: suddenly or sharply. 「突如」 leans toward written prose.
• SynonymパッとCasualColloquial mimetic word: in a flash, all at once; 「突如」 is more literary.
• Synonym急きゅうNeutralNeutral: sudden or urgent; 「突如」 is a more literary adverb.
• SynonymいきなりNeutralNeutral and common in speech: happening with no warning; 「突如」 is more literary.
• SynonymたちまちNeutralNeutral. A change completed in an instant; 「突如」 is about something occurring with no warning.
• RelatedふとNeutralNeutral. Unintentionally or by chance, as in 「ふと思い出す」; 「突如」 is about things happening with no warning.
• RelatedさっとNeutralNeutral mimetic word for brisk, quick action; 「突如」 stresses unexpected suddenness.
• Related急激きゅうげきNeutralNeutral adjectival noun for sharp, rapid change; 「突如」 is an adverb.
• RelatedやにわにWrittenWritten/formal prose. Someone acting suddenly and at once, catching others off guard; mostly for human actions, while 「突如」 also covers events and changes.
• Related俄然がぜんWrittenWritten/formal prose. Marks a sudden change in a situation, mood or resolve, as in 「俄然やる気が出る」; 「突如」 is about things happening with no warning.
• RelatedとみにWrittenWritten/formal prose. A sharp, all-at-once change, as in 「頓に増えた」; 「突如」 centers on the suddenness itself.
• Related突としてとつとしてWrittenWritten/formal prose and old-fashioned: suddenness. In everyday speech say 「突然」.
• Related忽然こつぜんWrittenWritten/formal prose. Sudden appearing or vanishing, as in 「忽然と消える」; very close to 「突如」.
• RelatedふいとCasualColloquial. A sudden move, often a quick turn; 「突如」 is more literary.
• RelatedふっとCasualColloquial mimetic word: suddenly, in a flash, as in 「ふっと笑う」; 「突如」 is more literary.
• RelatedつとWrittenWritten/formal prose. A quick, sudden movement as in 「つと立ち上がる」; it can also mean staying still. 「突如」 stresses the lack of warning.
• RelatedついとCasualColloquial. Happening quickly, all at once; 「突如」 is more literary.
• RelatedひょいとCasualColloquial mimetic word: lightly, nimbly or by chance; 「突如」 stresses the lack of warning and sounds more solemn.
• RelatedばっとCasualColloquial mimetic word: scattering or springing into action in a flash; 「突如」 is more literary.
• RelatedはたとWrittenWritten/formal prose. A sudden jolt of realization, as in 「はたと気づく」; 「突如」 centers on suddenness.
• RelatedつっとCasualColloquial. Moving quickly and smoothly; 「突如」 stresses suddenness.
• Antonym漸次ぜんじWrittenWritten/formal prose. Opposite to 「突如」 on sudden vs. gradual: it means gradually, little by little.
• Antonym徐々にじょじょにNeutralNeutral. Opposite to 「突如」 on sudden vs. gradual: it means slowly, little by little.

「突如」 is for something happening suddenly and without warning in written prose, as in 「突如現れた」 or 「突如中止する」. For ordinary suddenness use 「突然」, 「急に」 or 「いきなり」; for absent-minded or chance actions 「ふと」; for a sudden turn in a situation or mood 「俄然」. The antonyms 「徐々に」 and 「漸次」 point to gradual change instead.

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

1. 予想よそうしない事態じたいが前触まえぶれもなく起おこるさま。