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

CORE WORDS

Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Etymology Explore the origin of the 'core words'.
Wordsense Learn about the wordsenses of the english term. Verbs Nouns Adjectives Pronouns Prepositions Conjunctions

She is an earnest student .	Cô ấy là một sinh viên nghiêm túc.
He is being earnest today .	Hôm nay anh ấy rất nghiêm túc.