adv. 25B6; adverb DISTRESSINGLY, disturbingly, unendurably, unbearably, uncomfortably, unpleasantly; dreadfully; informal terribly, awfully; informal, dated frightfully.
PAINFULLY
Meaning of PAINFULLY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012