(n.) friend /frend/ → bạn → He is my friend. (n.) friendship /ˈfrendʃɪp/ → tình bạn → Their friendship is strong. (n.) friendliness /ˈfrendlinəs/ → sự thân thiện → Her friendliness is natural. (adj.) friendly /ˈfrendli/ → thân thiện → She is friendly. (adj.) friendly → (in a friendly way)→ (adv.)→ một cách thân thiện → She spoke in a friendly way. (adj.) unfriendly /ʌnˈfrendli/ → không thân thiện → He seems unfriendly.
