1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆ STEALTHILY; SECRETLY; FURTIVELY Adverb 悄悄地，轻轻地 một cách rón rén, một cách lén lút
☆ SECRETLY Adverb 悄悄地，轻轻地 lén lút, rón rén, bí mật