かなり・可也・可成りkanari[1]atamadaka (head-high)

1. adverb, no-adjective, na-adjectiveconsiderably; fairly; quite; rather; pretty
   ４マイルはかなりの距離きょりだ。↗

   Four miles is a good distance.

• SynonymなかなかNeutralNeutral. Means 'quite', often with a pleasantly surprised tone, as in 「なかなか上手だ」; before a negative it means 'not easily'.
• Synonym結構けっこうNeutralIn speech it means 'quite', as in 「結構おいしい」「結構高い」; it can also mean 'enough' or 'no thank you'.
• Synonym割とわりとCasualColloquial. Suggests more than expected, as in 「割と簡単だ」; the degree is a bit milder than 「かなり」.
• SynonymだいぶNeutralNeutral. Indicates a considerable degree, typically of change or progress that has built up, as in 「だいぶ良くなった」; mostly for amounts of change.
• SynonymとてもNeutralNeutral. Means 'very', as in 「とても寒い」; stronger than 「かなり」, and with a negative it means 'no matter what, cannot'.
• Synonym至っていたってWrittenWritten/formal prose. Means 'extremely', as in 「至って健康だ」; mostly modifies steady states, with a dignified tone.
• SynonymずいぶんNeutralNeutral. Means 'quite, very', often carrying the speaker's surprise or exclamation, as in 「随分変わったね」; can also mean 'excessive'.
• Synonym甚だはなはだWrittenWritten/formal prose. Means 'very, extremely' and mostly modifies negative words, as in 「甚だ遺憾だ」; stiff and formal in tone.
• Synonym大いにおおいにNeutralNeutral. Means 'greatly, fully' and mostly modifies actions, as in 「大いに楽しむ」「大いに期待する」.
• Synonym少なからずすくなからずWrittenWritten/formal prose. Means 'not a little, considerably', as in 「少なからず影響がある」; a tactful, understated tone.
• SynonymよほどNeutralNeutral. Means 'quite, very', often in conjecture, as in 「よほど疲れていたのだろう」; also in comparisons, as in 「〜よりよほどましだ」.
• SynonymよっぽどCasualA colloquial, emphatic form of 「余程」 with the same usage but a stronger tone.
• Synonym割り方わりかたCasualColloquial, meaning the same as 「割と」; the wording is somewhat dated, and it also means 'ratio, proportion'.
• SynonymわりかしCasualA slangy form of 「割と」 meaning 'fairly, quite'; even more casual, avoided in formal settings.
• Relatedある程度あるていどNeutralNeutral. Means 'to some extent', as in 「ある程度理解できる」; the degree is lower than 「かなり」 and carries a reservation.

Use 「かなり」 for a degree that is fairly high but not extreme. Say 「なかなか」 when something is better than expected, 「結構」 in speech, 「割と」 for a slightly milder degree, 「だいぶ」 for accumulated change, and 「とても」 for a higher degree.

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

1. 程度ていどが思おもいのほか甚はなはだしいこと。非常ひじょうにまでは行いかないが、それほど程度ていどが大おおきいさま。