いかにも・如何にもikanimo[2]nakadaka (mid-high)

1. adverbindeed; really; truly; just (like)indicating emotive conviction
   こんな格好かっこうをしているといかにもスポーツしてそうに見みえるけど、全然ぜんぜんやってないんだよ。↗

   I look for all the world like an athlete in this outfit, but the truth is I don't do any sports at all.
2. adverbvery; extremely; totally; terribly
3. adverb, interjectionabsolutely; certainly; for sureindicating agreement

• Synonym誠にまことにFormalFormal 'truly, indeed', used above all in set apologies and thanks such as 「誠に申し訳ない」; it does not carry the 'just as it looks' sense of 「いかにも」.
• Synonym実にじつにFormalFormal 'really, truly' with a measured tone; 「いかにも」 also stresses degree but adds that something looks or seems exactly so.
• SynonymまったくNeutralMeans 'completely, really'; with a negative it means 'not at all', and in speech 「全く」 alone voices exasperation. 「いかにも」 has neither use.
• Synonym大変たいへんNeutralAs an adverb, 'very', fine in polite speech: 「大変お世話になりました」. 「いかにも」 can mark degree too, but usually with a 'just as expected, just like it' feel.
• SynonymずいぶんCasualColloquial 'quite, rather', often with a note of surprise, as in 「随分寒い」, and it can mean 'too much'. 「いかにも」 conveys 'truly so'.
• Synonym甚だはなはだWrittenWritten and stiff; typical of formal regret or displeasure, as in 「甚だ残念だ」. 「いかにも」 can also mean 'looks just like'.
• Synonym極めてきわめてWrittenWritten 'extremely', stating degree objectively, as in 「極めて重要」, common in reports and formal prose; it never means 'looks like'.
• Synonym非常にひじょうにNeutralThe all-purpose 'very', as in 「非常に難しい」; it lacks the 'just as you would expect' flavour of 「いかにも」.
• Synonym本当にほんとうにNeutralNeutral 'really, truly', as in 「本当に嬉しい」, frequent in speech; 「いかにも」 can also say something looks exactly that way.
• Synonym大いにおおいにNeutral'Greatly', mostly qualifying actions: 「大いに楽しむ」, 「大いに期待する」. It does not mean 'looks like'.
• Synonym至極しごくWrittenWritten and stiff 'utterly'; it can precede, as in 「至極当然」, or follow a word, as in 「迷惑至極」. It does not mean 'looks just like'.
• SynonymたいそうWrittenWritten, slightly dated 'very'; it can also mean grand or large-scale, unlike 「いかにも」, which stresses looking exactly a certain way.
• SynonymよほどNeutral'Considerably', often paired with a guess, as in 「よほど疲れたのだろう」, stressing depth of degree; it can also mean 'nearly did', a sense 「いかにも」 lacks.
• SynonymとてもCasualThe everyday 'very', as in 「とても美しい」, and with a negative 'by no means'; it has no 'looks just like' sense.
• SynonymまさしくWrittenWritten; 'precisely, none other than', stressing a judgement is correct, as in 「まさしく本物だ」. 「いかにも」 leans toward 'certainly looks the part'.
• Synonym真にしんにFormalAnother spelling of 「誠に」, read 「まことに」, used the same way in formal thanks and apologies; 「いかにも」 also works in everyday description.
• SynonymすこぶるWrittenWritten 'exceedingly', as in 「すこぶる元気だ」, a little old-fashioned; everyday speech says 「とても」. It does not mean 'looks just like'.
• Related最ももっともNeutralThe superlative 'most', as in 「最も高い」, ranking first in a comparison; 「いかにも」 makes no comparison.
• RelatedどうにもNeutralRead 「どうにも」: with a negative, 'no way at all'; also 'extremely'. It merely shares kanji with 「いかにも」 and is not a true opposite.
• AntonymいやCasual'No, that's not so', rejecting what was said; it contrasts with 「いかにも」 only as a reply of agreement ('quite so').

For 'just as you would expect, every bit the …' use 「如何にも」, as in 「いかにも彼らしい」. For plain high degree, 「とても」 or 「非常に」; for formal apologies and thanks, 「誠に」.

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

1. 程度ていどがはなはだしい様さま。実じつに。本当ほんとうに。全まったく。
2. 見みえたり感かんじられたりする様さまを強調きょうちょうする。推量すいりょうや様態ようたい、比喩ひゆの明確化めいかくか。まさしく、みるからに（そのようだ）。
3. 他者たしゃの主張しゅちょうに同意どういする意いを表あらわす。なるほど。確たしかに。そのとおり。