Source : Webster's Revised Unabridged Dictionary (1913)

High-flown \High"-flown`\, a.
   1. Elevated; proud. ``High-flown hopes.'' --Denham.

   2. Turgid; extravagant; bombastic; inflated; as, high-flown
      language. --M. Arnold.

Source : WordNet®

high-flown
     adj 1: pretentious (especially with regard to language or ideals);
            "high-flown talk of preserving the moral tone of the
            school"; "a high-sounding dissertation on the means to
            attain social revolution" [syn: {high-sounding}, {inflated}]
     2: of high moral or intellectual value; elevated in nature or
        style; "an exalted ideal"; "argue in terms of high-flown
        ideals"- Oliver Franks; "a noble and lofty concept" [syn:
        {exalted}, {high-minded}, {lofty}, {rarefied}, {rarified},
         {idealistic}, {noble-minded}]