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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 aete 敢えて【あえて】 dare to; daringly; deliberately; purposely ~ N1
2 akumade mo あくまでも to the end; persistently; absolutely; is still very ~ N1
3 an no jou 案の定【あんのじょう】 just as one thought; as usual; sure enough N1
4 arakajime あらかじめ beforehand; in advance; previously ​ N1
5 dou nimo~nai どうにも~ない not … by any means; no matter how hard one tries, cannot ~ N1
6 gotoki / gotoku / gotoshi ごとき / ごとく / ごとし like; as if; the same as ~ N1
7 ikani いかに how; in what way; how much; to what extent N1
8 ikani mo いかにも indeed; really; truly; just (like); very; extremely ~ N1
9 katagata かたがた while; at the same time; incidentally; for the purpose of ~ N1
10 katawara かたわら while; besides; at the same time; in addition N1
11 katsute かつて once; before; formerly; ever; former; ex- N1
12 koto gotoku ことごとく altogether; entirely; completely ~ N1
13 marukkiri まるっきり completely; absolutely; totally; (not) at all​ ~ N1
14 mohaya もはや already; now; no longer; not anymore N1
15 nan to iu / nanto / nante なんという / なんと / なんて how (beautiful, etc.); what a ~ N1
16 nani shiro 何しろ【なにしろ】 at any rate; after all; anyhow; anyway; in any case; because; as you know ~ N1
17 nari ni / nari no なりに / なりの suitable; in one's own way/style N1
18 nari tomo なりとも at least; even just a little (adverbial particle) N1
19 no nan notte のなんのって extremely ~ (cannot be expressed in words) N1
20 ori ni 折に【おりに】 when; at the time; on the occasion ~ N1
21 oyoso およそ about; roughly; generally; approximately; completely​ ~ N1
22 samo さも really (seem, appear, etc.); truly; as if ~ N1
23 sazo さぞ surely; certainly; no doubt; indeed​ ~ N1
24 ta hazumi ni / ta hyoushi ni た弾みに / た拍子に【たはずみに / たひょうしに】 the moment [A], unintentionally / inadvertently caused something to happen N1
25 tada~nomi da ただ~のみだ all we can do is; can do nothing but; only ~ N1
26 to aimatte と相まって【とあいまって】 together with..., more; because of the influence of..., more ~ N1
27 tomo sureba ともすれば apt to (do); tend to; liable to; prone to ~ N1
28 toriwake とりわけ especially; above all ~ N1
29 tossa ni とっさに at once; right away; promptly N1