Pretentious Language
pre-ten-tious: adjective \pri-'ten(t)-sh∂s\
1: characterized by pretension:
a: making usually unjustified or excessive claims (as of value or standing)
b: expressive of affected, unwarranted, or exaggerated importance, worth, or stature
Jargon
jar-gon: noun \'jär-g∂n, -gän\
1: a: confused unintelligible language
2: the technical terminology or characteristic idiom of a special activity or group
Cliché
cli-ché: noun \klē-shā, kli-'\
1: a trite phrase or expression; also: the idea expressed by it
2: a hackneyed theme, characterization, or situation
George Orwell's fabulous essay on this subject, "Politics and and the English Language"
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