усърден означава в английски

assiduous▼(hard-working, diligent)
adjective
[UK: ə.ˈsɪ.djuəs] [US: ə.ˈsɪ.dwəs]

diligent▼(hard-working and focused)
adjective
[UK: ˈdɪ.lɪ.dʒənt] [US: ˈdɪ.lɪ.dʒənt]

hardworking▼(taking their work seriously and doing it well and rapidly, see also: industrious)
adjective
[UK: hɑːd.ˈwɜːkɪŋ] [US: ˈhɑːr.ˌdwərkɪŋ]

industrious▼(hard-working and persistent)
adjective
[UK: ɪn.ˈdʌ.strɪəs] [US: ˌɪn.ˈdə.striəs]

painstaking▼(careful attentive; diligent)
adjective
[UK: ˈpeɪnz.teɪkɪŋ] [US: ˈpeɪn.ˌstekɪŋ]

sedulous [sedulouser, sedulousest]▼(of a person: diligent in application or pursuit)
adjective
[UK: ˈse.djʊ.ləs] [US: ˈse.djʊ.ləs]

strenuous▼(having great vigour)
adjective
[UK: ˈstre.njʊəs] [US: ˈstre.njuːəs]

zealous▼(full of zeal; ardent)
adjective
[UK: ˈze.ləs] [US: ˈze.ləs]