List: adverb (fukushi)

irregular okurigana  archaic  な adjective  adjective (generic)  adverb  noun  noun (generic) 

• straight (ahead), direct, upright, erect
• straightforward, honest, frank

popular  rarely used kanji form  JLPT N1  usually written using kana alone  adverb  noun taking the genitive case particle の  adjective (generic) 

• once, before, formerly, ever, former, ex-
• never yet, never before, first time, still not happened

gikun or jukujikun  rarely used kanji form  noun  noun (generic)  adverb 

• (depending on) how, (depending on) what, nature (of)
• what is ...?, how is ...?, what will be ...?

adverb 

• in a few days, at an early date

noun  noun (generic)  adverb 

• thousands of years, eternity, all generations

adverb 

• (if) by some very rare chance, in the very unlikely event that ...

archaic  adverb 

• must not, may not

JLPT N1  noun  noun (generic)  adverb 

• during the night, at night

popular  rarely used kanji form  usually written using kana alone  noun  noun (generic)  adverb 

• as (it is), remaining (in a state), keeping (the same), leaving (unchanged)
• with (e.g. one's eyes closed, the light on), while (e.g. standing, alive), as
• as (one pleases, one is told, etc.), according to
• sic

rarely used kanji form  onomatopoeic or mimetic word  usually written using kana alone  adverb  adverb taking the と particle 

• carefully, closely, attentively, profoundly, deeply, at length