Etymology
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blatant (adj.)

coined 1596 by Edmund Spenser in "The Faerie Queen," in blatant beast, a thousand-tongued monster representing slander; perhaps primarily alliterative, perhaps suggested by Latin blatire "to babble." It entered general use by 1650s as "noisy in an offensive and vulgar way;" the sense of "obvious, glaringly conspicuous" is from 1889. Related: Blatantly; blatancy.

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Definitions of blatant

blatant (adj.)
without any attempt at concealment; completely obvious;
a blatant appeal to vanity
blatant disregard of the law
Synonyms: blazing / conspicuous
blatant (adj.)
conspicuously and offensively loud; given to vehement outcry;
blatant radios
Synonyms: clamant / clamorous / strident / vociferous
From wordnet.princeton.edu