なかなか・中々・中中・仲々・仲仲・却々・却却nakanaka[0]heiban (flat)

1. adverb, na-adjectivevery; considerably; easily; readily; fairly; quite; highly; rather
   あいつは、なかなかいい奴やつだぜ！↗

   He is a good joker.
2. adverbby no means; not readilywith a verb in the negative
   いまどき良よい仕事しごとはなかなか得えがたいのを忘わすれないでね。↗

   Don't forget that good jobs are very hard to come by these days.
3. nounmiddle; half-way point
4. no-adjectiveexcellent; wonderful; very good

• SynonymかなりNeutralMeans 'considerably, quite'; common in speech and writing, a step below 「非常に」, as in 「かなり寒い」. Unlike 「なかなか」 it lacks the nuance of pleasant surprise.
• Synonym結構けっこうNeutralMeans 'quite, more than expected'; fits both praise and criticism, as in 「結構おいしい」「結構寒い」; common in speech.
• Synonym割とわりとCasualColloquial; means 'more than one expected', as in 「割と簡単だ」; it carries surprise, but the degree is lighter than 「なかなか」.
• SynonymよほどCasualColloquial; means 'quite, very'; also seen as 「よほど〜らしい」 for conjecture, and with a negative it means 'only as a last resort'.
• Synonym大変たいへんNeutralMeans 'very'; it can also mean 'terrible', as in 「大変だ」; the degree is higher than 「なかなか」.
• SynonymごくWrittenMostly written; means 'extremely'; as in 「ごく普通」「ごく一部」 it modifies a small range or degree, with no nuance of surprise.
• Synonym極めてきわめてWrittenWritten prose; means 'extremely', as in 「極めて重要」; a far higher degree than 「なかなか」.
• SynonymよっぽどCasualThe colloquial spelling of 「余程」; means 'quite, very' or 'very nearly did', as in 「よっぽど疲れたんだね」.
• Synonym実にじつにNeutralRead まことに here (as in 「誠に」), not じつに: 'truly, sincerely', used mostly in solemn apologies and thanks, as in 「誠に申し訳ない」.
• Synonym至っていたってWrittenWritten; means 'extremely', as in 「至って元気」「至って簡単」; plain in tone, with no sense of surprise.
• Synonym甚だはなはだWrittenWritten prose; means 'very, extremely'; often with negative content, as in 「甚だ遺憾」.
• SynonymたいそうWrittenWritten; means 'very' or 'exaggerated', as in 「大層な口を利く」; slightly old-fashioned.
• Synonym非常にひじょうにNeutralMeans 'very'; formally neutral and common in both speech and writing, but lacks 「なかなか」's nuance of pleasant surprise.
• SynonymとびきりCasualColloquial; means 'top-notch, exceptionally', as in 「とびきり美味しい」; stresses standing out above the rest.
• SynonymずいぶんNeutralMeans 'quite, very'; it can also carry reproach, as in 「随分ひどい」, and often implies surprise.
• Synonym割り方わりかたCasualColloquial; means 'relatively, quite'; synonymous with 「割と」 but used less often.
• SynonymわりかしCasualSlangy; means 'relatively, quite'; same as 「割と」 but even more casual, so avoid it in formal settings.
• SynonymすこぶるWrittenWritten prose; means 'extremely', as in 「すこぶる元気」; it has an old-fashioned flavor.
• SynonymごくごくWrittenA written emphatic form of 「極」; means 'extremely', as in 「ごくごく普通」; the tone is heavier.
• SynonymめっぽうCasualSlangy; means 'extremely, extraordinarily', as in 「滅法強い」.

For 'quite, fairly' the default is 「なかなか」; with a negative it means 'not easily'. Use 「かなり」 or 「結構」 for plain 'considerably', and 「非常に」 or 「とても」 for 'very'. In formal writing choose 「極めて」 or 「甚だ」; for solemn apologies or thanks, 「誠に」. In casual speech, 「割と」 and 「ずいぶん」 also work.

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

1. すこぶる。随分ずいぶん。かなり。
2. （打ち消うちけしの語ごともに）容易たやすく。容易よういに。すぐには。長時間ちょうじかん。
3. かなりの程度ていど。
4. かなり困難こんなんなさま。