DictionaryRoot: noxa
Latin
noxa
injury, harm
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adjective
obnoxious
ub-NAHK-shus/əbˈnɑːkʃəs/
Extremely unpleasant or annoying.
Etymology
The pieces originally suggest being exposed to injury, not causing annoyance. The word shifted from vulnerability or subjection to being offensive and objectionable, under the influence of noxious.