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
☆☆☆ WITHOUT FAIL; AT ANY COST; CERTAINLY Adverb 一定，必定 nhất định
☆ INFALLIBLY; PUNCTUALLY Adverb 一定，必定 không lỡ (hẹn), y rằng