highly objectionable or offensive; odious: obnoxious behavior.
annoying or objectionable due to being a showoff or attracting undue attention to oneself: an obnoxious little brat.
Archaic. exposed or liable to harm, evil, or anything objectionable.
Obsolete. liable to punishment or censure; reprehensible.

1575–85; < Latin obnoxiōsus harmful, equivalent to ob- ob- + noxiōsus noxious

obnoxiously, adverb
obnoxiousness, noun
unobnoxious, adjective
unobnoxiously, adverb

1. See hateful.

1. delightful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obnoxious (əbˈnɒkʃəs)
1.  extremely unpleasant
2.  obsolete exposed to harm, injury, etc
[C16: from Latin obnoxius, from ob- to + noxa injury, from nocēre to harm]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1581, from L. obnoxiosus "hurtful, injurious," from obnoxius "subject to harm," from ob "to, toward" + noxa "injury, hurt, damage entailing liability" (see noxious). Originally "subject to authority, subject to something harmful;" meaning "offensive, hateful" is first recorded
1675, influenced by noxious (q.v.).
"Obnoxious has two very different senses, one of which (exposed or open or liable to attack or injury) requires notice because its currency is now so restricted that it is puzzling to the uninstructed. It is the word's rightful or de jure meaning, and we may hope that scholarly writers will keep it alive." [Fowler]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Civil rights protesters did not use violence nor did they obnoxiously taunt their presumed antagonists.
Nor has she ever been obnoxiously offensive either diplomatically or morally.
Obnoxiously squawking on loudspeakers all day and half the night.
Act up and behave obnoxiously and you will face consequences.
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