OBNOXIOUS Meaning of OBNOXIOUS in English adj. offensive, objectionable, disliked. Derivatives: obnoxiously adv. obnoxiousness n. Etymology: orig. vulnerable (to harm), f. L obnoxiosus or obnoxius (as OB-, noxa harm: assoc. with NOXIOUS) Oxford English vocab. Оксфордский английский словарь. 2012