Definition of highfalutin adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌhaɪfəˈluːtɪn//
; NAmE NAmE//ˌhaɪfəˈluːtɪn//
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trying to be serious or important, but in a way that often appears silly and unnecessary synonym pretentious highfalutin language Word Originmid 19th cent. (originally US): perhaps from high + fluting (present participle of flute).
See the Oxford Advanced American Dictionary entry: highfalutin