popular  onomatopoeic or mimetic word  noun or participle taking the aux. verb する  verb (generic)  noun (generic)  adverb  adverb taking the と particle 

• to fret (over), to brood (about), to mope, to worry
• worriedly, (fretting) constantly, (worrying) over this and that, (obsessing) to no end

popular  onomatopoeic or mimetic word  adverb  adverb taking the と particle  noun or participle taking the aux. verb する  verb (generic)  noun (generic) 

• whirling, revolving, spinning, going round and round
• coiling around, winding around, rolling around
• working tirelessly, working hard
• constantly changing

popular  JLPT N3  onomatopoeic or mimetic word  adverb  adverb taking the と particle 

• soundly (sleeping), fast (asleep)

popular  onomatopoeic or mimetic word  adverb  adverb taking the と particle  noun or participle taking the aux. verb する  verb (generic)  noun (generic) 

• limply, wearily, listlessly, languidly, exhaustedly, unenergetically

popular  onomatopoeic or mimetic word  adverb  adverb taking the と particle  noun or participle taking the aux. verb する  verb (generic)  noun (generic)  noun taking the genitive case particle の  adjective (generic)  な adjective 

• wobbling, tottering, shaking, unstably, unsteadily
• wavering (e.g. over a decision), dithering, indecisively
• boiling up
• dizzily, giddily

popular  onomatopoeic or mimetic word  adverb  adverb taking the と particle 

• (turning) round and round, in circles
• wrapping around, winding around

popular  onomatopoeic or mimetic word  adverb  adverb taking the と particle  noun or participle taking the aux. verb する  verb (generic)  noun (generic) 

• sneakily, secretly, stealthily, on the sly

popular  JLPT N2  onomatopoeic or mimetic word  adverb  adverb taking the と particle 

• stealthily, secretly, in secret

popular  search-only kana form  JLPT N2  onomatopoeic or mimetic word  adverb 

• quickly, promptly, immediately, without delay, briskly, hurriedly, hastily
• indifferently, coldly

popular  JLPT N3  onomatopoeic or mimetic word  adverb  adverb taking the と particle  noun or participle taking the aux. verb する  verb (generic)  noun (generic)  な adjective  adjective (generic) 

• feeling refreshed, feeling relieved
• neat, tidy, clean
• frank, open-hearted, plain, simple, light
• completely, entirely
• not in the least (with neg. verb), not at all
• nothing at all, completely useless, hopeless, awful