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
☆☆ QUICKLY Adverb 飞快地，赶紧 một cách nhanh nhẹn
☆ CHEERFUL; LIVELY Adjective 快活 하다 快活，开朗，爽朗，明快 nhanh nhẹn, linh hoạt
☆ QUICK Adjective 迅速，敏捷 nhanh nhẹn
☆ QUICK; NIMBLE Adjective 迅速，敏捷 lanh lợi, lanh lẹ, nhanh nhẹn