assiduous(hard-working, diligent) adjective [UK: ə.ˈsɪ.djuəs] [US: ə.ˈsɪ.dwəs]My dog continues assiduously to keep me company. = Il mio cane continua assiduamente a tenermi compagnia.
frequent(done or occurring often) adjective [UK: frɪ.ˈkwent] [US: ˈfriː.kwənt]
intensive(characterized by persistence; intent; assiduous) adjective [UK: ɪn.ˈten.sɪv] [US: ˌɪn.ˈten.səv]