ずんと

ずんと, づんとzunto

adverb

  1. much
  2. remarkably
  3. noticeably
  4. not at all (with neg. verb)
  5. quickly and vigorously
  6. unhesitatingly

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences