adj. 25B6; adjective PERSISTENT, insistent, tenacious, persevering, dogged, unrelenting, tireless, indefatigable; aggressive, high-pressure; informal pushy; formal exigent, pertinacious.
IMPORTUNATE
Meaning of IMPORTUNATE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012