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Adverbs (ふく) are words that modify other words (verbs, adjectives, other adverbs, and even full sentences).

In Japanese, adjectives can be turned into adverbs by adding に (ni) at the end. This is similar to the English ‘ly’, as in quickly.

# Romaji Japanese Grammar Meaning Level
1 aruiwa あるいは or; either; maybe; perhaps; possibly ~ N2
2 bakari ni ばかりに simply because; on account of~ (negative result) N2
3 dou yara どうやら possibly; apparently; seems like; somehow; barely ~ N2
4 douse どうせ anyhow; in any case; at any rate; after all; no matter what N2
5 futatabi 再び【ふたたび】 again; once more N2
6 gyaku ni 逆に【ぎゃくに】 conversely; on the contrary ~ N2
7 hanmen 反面【はんめん】 while, although; on the other hand~ N2
8 hatashite 果たして【はたして】 as was expected; sure enough; really; actually ~ N2
9 ichiou 一応【いちおう】 more or less; pretty much; roughly; tentatively ~ N2
10 igai 以外【いがい】 with the exception of; excepting ~ N2
11 ijou ni 以上に【いじょうに】 more than; not less than; beyond ~ N2
12 ikinari いきなり abruptly; suddenly; all of a sudden; without warning N2
13 ikki ni 一気に【いっきに】 in one go; without stopping; all at once; immediately; instantly; right away ~ N2
14 ittan 一旦【いったん】 once; for a short time; briefly; temporarily N2
15 madashimo まだしも rather; better​ ~ N2
16 mattaku~nai 全く~ない【まったく~ない】 not at all ~ N2
17 motomoto 元々【もともと】 originally, by nature, from the start N2
18 nao なお still; yet​; furthermore; in addition ~ N2
19 osoraku 恐らく【おそらく】 perhaps; likely; probably; I dare say ~ N2
20 roku ni~nai ろくに~ない not well; not enough; improperly; insufficiently; unsatisfactorily​ ~ N2
21 saisan 再三【さいさん】 again and again; repeatedly N2
22 saiwai na koto ni 幸いなことに【さいわいなことに】 fortunately; luckily; thankfully ~ N2
23 sassoku 早速【さっそく】 at once; immediately; without delay; promptly N2
24 sekkaku せっかく especially; (thank you for) troubling to, going to great pains for ~ N2
25 semete せめて at least; at most ~ N2
26 shidai ni 次第に【しだいに】 gradually (progress into a state); in sequence; in order N2
27 sono ue その上【そのうえ】 besides; in addition; furthermore ~ N2
28 sue ni 末に【すえに】 finally; after; following; at the end/ conclusion of ~ N2
29 sukoshi mo~nai 少しも~ない【すこしも~ない】 not one bit; not even a little ~ N2
30 sukunaku tomo 少なくとも【すくなくとも】 at least ~ N2
31 tadachi ni 直ちに【ただちに】 at once; immediately; directly; in person; automatically ~ N2
32 to douji ni と同時に【とどうじに】 at the same time as; while; simultaneously ~ N2
33 tokku ni とっくに long ago; already; a long time ago N2
34 wa moto yori はもとより also; let alone; from the beginning N2
35 wa tomokaku はともかく anyhow; anyway; regardless; in any case; whether or not ~ N2
36 wazuka ni わずかに slightly; only; barely; narrowly ~ N2
37 yagate やがて before long; soon; almost; eventually ~ N2
38 yohodo / yoppodo よほど / よっぽど very; greatly; much; to a large extent N2
39 you suru ni 要するに【ようするに】 in short; in a word; to sum up; to put it simply ~ N2