甚だ|はなはだhanahada[0]heiban (flat)

1. adverbvery; greatly; extremely; exceedingly; highly; quite
   彼かれはやたらに故事こじ来歴らいれきに詳くわしいけれど、それが人生じんせいの役やくに立たっているのかはなはだ疑問ぎもんだね。↗

   He has a great storehouse of knowledge about historical details but I seriously doubt that's of any use in life.

• SynonymまったくNeutralWith a negative, 'not at all, completely not' — opposite in degree to 「甚だ」.
• Synonym誠にまことにFormalFormal: really, truly — used in solemn thanks and apologies. 「甚だ」 is written-style and often modifies negative words, as in 「甚だ遺憾」.
• Synonym大変たいへんNeutralNeutral: 'very', common in speech; also says a situation is serious. 「甚だ」 is written-style and usually carries a negative nuance.
• SynonymずいぶんNeutralColloquial: 'considerably, quite', with a sense of surprise. 「甚だ」 is more written and solemn.
• Synonym非常にひじょうにNeutralNeutral, leaning formal: the standard 'very'. 「甚だ」 more often modifies negative words.
• SynonymごくNeutral'Extremely', as in 「ごく普通」 and 「ごく自然」; common in speech too. 「甚だ」 is written and solemn.
• Synonym極めてきわめてWrittenWritten and formal: 'extremely'. 「甚だ」 tends to modify negative words.
• SynonymたいそうNeutral'Very' with an exaggerated, emphatic tone. 「甚だ」 is written and solemn, often with negative words.
• Synonym実にじつにFormalSame word as 誠に (variant 実に); used in solemn thanks and apologies like 「誠に申し訳ない」. 「甚だ」 stresses extreme degree.
• Synonym大いにおおいにNeutral'Greatly, to the fullest' — mostly with positive actions, as in 「大いに楽しむ」. 「甚だ」 is written-style and expresses extreme degree.
• Synonym至極しごくWritten'Extremely'; adverbial as in 「至極当然」, or after a noun as in 「残念至極」. Like 「甚だ」, it is written and solemn.
• SynonymいかにもNeutral'Indeed, just as it appears' — stresses agreement or resemblance. 「甚だ」 stresses extreme degree.
• SynonymやたらNeutralColloquial: 'excessively, indiscriminately'. 「甚だ」 is written-style and speaks purely of degree.
• SynonymかなりNeutralColloquial 'considerably, rather' — a lower degree. 「甚だ」 is stronger and more written.
• SynonymとてもNeutralThe most common spoken 'very'. 「甚だ」 is written and solemn.
• Synonym何ともなんともNeutral'Very', or with a negative 'not at all'. 「甚だ」 only expresses degree.
• Synonym至っていたってNeutralPlain, objective 'very'. 「甚だ」 more often modifies negative words.
• SynonymだいぶNeutralColloquial 'considerably, a lot'. 「甚だ」 is written and solemn.
• SynonymなかなかNeutral'Considerably, quite'; with negatives, 'not easily'. 「甚だ」 expresses a higher degree.
• SynonymよほどNeutral'Considerably'; also marks conjecture, as in 「よほど〜らしい」. 「甚だ」 is written-style.
• SynonymひどくNeutral'Terribly, severely' — mostly negative; close to 「甚だ」 but more colloquial.
• SynonymよっぽどCasualColloquial emphatic form of 「余程」: 'very, considerably'. 「甚だ」 is written-style.
• SynonymすこぶるWrittenWritten and rather old-fashioned: 'extremely, very much'. 「甚だ」 is more common.
• SynonymごくごくNeutral'Extremely', stressing the very highest degree; used in speech as well. 「甚だ」 is written and solemn.
• SynonymいともWrittenWritten style: 'extremely', as in 「いとも簡単に」. 「甚だ」 more often takes negative words.
• Synonym世にもよにもNeutralIdiomatic: 'exceptionally, as rarely seen in this world'. 「甚だ」 is more written.
• SynonymめっぽうCasualColloquial: 'extraordinarily', with a note of surprise. 「甚だ」 is written-style.
• SynonymこよなくWrittenWritten: 'matchlessly', with a heartfelt nuance. 「甚だ」 more often modifies negative words.
• SynonymそれはそれはNeutralAn interjection of surprise, or an emphatic 'very'. 「甚だ」 is purely an adverb.
• Related最ももっともNeutralSuperlative 'most' — ranks first among several. 「甚だ」 only expresses high degree, without comparison.
• Related思い切りおもいきりNeutral'To one's heart's content, with all one's strength, thoroughly'. 「甚だ」 speaks of how high a degree is.
• Related最さいWrittenA prefix meaning 'most-', as in 「最先端」. 「甚だ」 is an adverb.
• Antonym少しもすこしもNeutralAntonym: with a negative, 'not at all, not a bit' — the opposite of 「甚だ」's extreme degree.

Use 「甚だ」 for a solemn, written way to say the degree is extreme, as in 「甚だ遺憾」, 「甚だ迷惑」, or 「甚だ光栄」; it often pairs with negative words. In everyday speech say 「とても」 or 「すごく」; in formal language, 「非常に」 or 「極めて」. For solemn thanks or apologies use 「誠に」. For 'not at all', use 「少しも」.

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

1. 普通ふつうの程度ていどをはるかに過すぎているさま。