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Adverbs (副ふく詞し) 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	chotto	ちょっと	a little	N5
2	choudo	丁度【ちょうど】	exactly	N5
3	daijoubu	大丈夫【だいじょうぶ】	OK; okay; alright; problem free	N5
4	dandan	だんだん	gradually	N5
5	dou	どう	how; in what way; how about	​ N5
6	doumo	どうも	thank you; thanks	N5
7	doushite	どうして	why; for what reason; how	N5
8	douzo	どうぞ	please	N5
9	hajimete	初めて【はじめて】	for the first time	N5
10	hitori	一人【ひとり】	one person​; alone; single	N5
11	ichiban	一番【いちばん】	number one; first; 1st, first place​; best; most	​ N5
12	ikaga	いかが	how; in what way; how about	​ N5
13	ikura	いくら	how much?; how many?	​ N5
14	ikutsu	いくつ	how many?,how old?	N5
15	iroiro	色々 【いろいろ】	various	N5
16	issho ni	一緒に【いっしょに】	together	N5
17	itsumo	いつも	always; usually; habitually	N5
18	kekkou	結構【けっこう】	splendid, enough	N5
19	mada	まだ	still; not yet	N5
20	mada ~te imasen	まだ～ていません	have not yet ~	N5
21	mae ni	前に【まえに】	before; in front of ~	N5
22	massugu	真っ直ぐ【まっすぐ】	straight ahead,direct	N5
23	minna	みんな	all; everyone; everybody	N5
24	motto	もっと	more; longer; further	N5
25	mou	もう	already; anymore; again; other	N5
26	naze	何故【なぜ】	why; how	N5
27	onaji	同じ【おなじ】	same	N5
28	sugu ni	直ぐに【すぐに 】	immediately; right away; instantly	​ N5
29	sukoshi	少し【すこし】	a little (bit); small quantity; few; short distance	N5
30	tabun	多分【たぶん】	perhaps; probably	N5
31	taihen	大変 【たいへん】	very; greatly; terribly; serious; difficult	N5
32	tokidoki	時々【ときどき】	sometimes; at times	N5
33	totemo	とても	very; awfully; exceedingly	​ N5
34	yoku	よく	often, well	N5
35	yukkuri	ゆっくり	slowly	N5