大した|たいしたtaishita[1]atamadaka (head-high)

1. pre-noun adjectivalconsiderable; great; important; significant; a big deal
   それはたいした問題もんだいではない。↗

   That is not much of a problem.

• RelatedかなりNeutralAn adverb meaning 'considerably, quite' that modifies adjectives and verbs; 「大した」 is a pre-noun word modifying only nouns, often in the negative 「大したことない」.
• Related著しいいちじるしいWrittenAn adjective for something striking or obvious, as in 「著しい成長」; it leans toward written prose, while 「大した」 is a pre-noun word common in speech.
• RelatedずいぶんNeutralAn adverb meaning 'quite, very' and also 'excessive'; 「大した」 only modifies nouns.
• RelatedよっぽどCasualA colloquial emphatic form of 「よほど」 meaning 'very, considerably' or 'just about to'; 「大した」 modifies nouns.
• Related実にじつにWrittenA written-style adverb meaning 'truly, indeed'; 「大した」 is a pre-noun word that leans colloquial.
• Related結構けっこうNeutralAs an adverb it means 'considerably', as an adjectival noun 'splendid' or 'no, thank you'; 「大した」 carries admiration or negation.
• Related誠にまことにFormalA formal adverb meaning 'truly, indeed', common in apologies and thanks like 「誠に申し訳ない」; 「大した」 modifies nouns.
• RelatedえらいNeutralAn adjective for 'great' or 'high-ranking', also 'serious'; 「大した」 modifies nouns and carries admiration.
• RelatedとてもNeutralThe most common spoken adverb for 'very'; 「大した」 modifies nouns.
• RelatedまったくNeutralAn adverb meaning 'completely'; with a negative it means 'not at all', while 「大した」 stresses a large degree.
• RelatedよほどNeutralAn adverb meaning 'considerably, very' or 'just about to'; 「大した」 is a pre-noun word that modifies nouns.
• RelatedことのほかWrittenA written adverb meaning 'exceptionally' or 'unexpectedly', as in 「殊の外喜ぶ」; 「大した」 modifies nouns.
• Antonym取るに足らないとるにたらないNeutralThe opposite of 「大した」 in value: not worth mentioning.
• Antonym些細なNeutralThe opposite of 「大した」 in degree: trivial, insignificant.

Use 「大した」 before a noun to say something is remarkable or serious, often as 「大したことない」. For adverbs meaning 'very', choose 「とても」, 「かなり」 or 「随分」; for 'striking' use 「著しい」; the opposite in degree is 「些細な」.

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

1. 数多かずおおくの。
2. 非常ひじょうな、大変たいへんな。
3. 重大じゅうだいな。
4. （後あとに打ち消うちけしを伴ともない）取り立とりたてて言いうほどの。