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
☆ SLUGGISHNESS Noun 不振不振，不良，低迷 sự không tiến triển
☆ DEPRESSION; STAGNATION Noun 沈滞停滞，疲滞，沉滞，呆滞 sự đình trệ