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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 amari あまり so much… that N3
2 amari ni mo あまりにも too much; so much… that; excessively ~ N3
3 betsu ni~nai べつ に~ない not really, not particularly N3
4 donna ni~temo どんなに~ても no matter how (much) N3
5 doushitemo どうしても no matter what; at any cost; after all ~ N3
6 futatabi 再び【ふたたび】 again; once more; a second time N3
7 futo ふと suddenly; accidentally; unexpectedly; unintentionally ~ N3
8 ichido ni 一度に【いちどに】 all at once N3
9 igai 意外【いがい】 unexpected; surprising N3
10 ikura~temo いくら~ても no matter how ~ N3
11 imani 今に【いまに】 before long; even now N3
12 imanimo 今にも【いまにも】 at any moment; at any minute; on the verge of N3
13 isshu 一種【いっしゅ】 species; kind; variety N3
14 issou 一層【いっそう】 much more; still more; all the more; single layer; sooner; preferably ​ N3
15 ittai 一体【いったい】 emphasis; what on earth; what in the world N3
16 ka nani ka か何か【かなにか】 or something ~ N3
17 kekkyoku 結局【けっきょく】 after all; eventually; in the end ~ N3
18 kesshite~nai 決して~ない【けっして~ない】 never; by no means ~ N3
19 kyuuni 急に【きゅうに】 swiftly; rapidly; quickly; immediately; hastily N3
20 manichi 万一【まんいち】 emergency; unlikely event​; by some chance; by some possibility N3
21 maru de まるで as if; as though; just like ~ N3
22 metta ni~nai めったに~ない hardly; rarely; seldom N3
23 moshika shitara もしかしたら perhaps; maybe; perchance; by any chance ~ N3
24 moshimo~tara もしも〜たら if; in the case; supposing ~ N3
25 mushiro むしろ rather; instead; better ~ N3
26 nakanaka なかなか very; quite; pretty; rather; just not ~ N3
27 nanka / nante / nado なんか / なんて / など give examples; show modesty; make light of ~ N3
28 naru beku なるべく as much as possible N3
29 sai ni 際に【さいに】 when; at the time of; in the case of ~ N3
30 saichuu ni 最中に【さいちゅうに】 while; during; in the middle of ~ N3
31 sara ni さらに furthermore; again; more and more ~ N3
32 seizei せいぜい at the most; at best; to the utmost N3
33 shibaraku しばらく for a moment; for a while; for the time being N3
34 sude ni すでに something has already been done/taken place; is already the case N3
35 sukoshimo 少しも【すこしも】 anything of; not one bit (with negative sentence) N3
36 sunawachi すなわち in other words; namely ~ N3
37 ta totan たとたん as soon as; just as ~ N3
38 tabi ni たびに whenever; every time ~ N3
39 tashika ni 確かに【たしかに】 surely, certainly ~ N3
40 tashou 多少【たしょう】 more or less; somewhat; a little; a few; some N3
41 tatoe~temo たとえ~ても even if… is the case N3
42 tatoeba 例えば【たとえば】 for example; for instance ~ N3
43 to tomo ni と共に【とともに】 together with; at the same time as; as well as ~ N3
44 tochuu de / tochuu ni 途中で/途中に【とちゅうで/とちゅうに】 on the way; in the middle of ~ N3
45 toori ni とおりに in the same way as; in the way; as ~ N3
46 totemo~nai とても~ない cannot possibly be; hardly ~ N3
47 tsui つい accidentally; unintentionally; by mistake N3
48 tsui ni ついに finally; at last; in the end ~ N3
49 tsuide ni ついでに while, incidentally, at the same time, on the way ~ N3
50 tsumari つまり in other words; in summary; in short ~ N3
51 wa mochiron はもちろん not to mention; not only ... but also ~ N3
52 wari ni 割に【わりに】 considering ~; for ~; despite ~ N3
53 wazato わざと on purpose; intentionally ~ N3
54 wazawaza わざわざ to go to the trouble of; to go out of one's way to ~ N3
55 zuibun 随分【ずいぶん】 very; extremely; surprisingly; considerably; awfully N3