1. Moving upward or along at a considerable height
   "some highflying fighter pilot fired a cannon shell into it" 
2. Extravagant or ambitious or extreme in aims or opinions
   "they did not understand what had happened at the once highflying company"

See also: ascending, unrestrained

• indisputably
• indissoluble
• indissolubly
• indistinct
• indistinctive
• indistinctly
• indistinctness
• indistinguishability
• indistinguishable
• indistinguishably
• indite
• indium
• individual
• individual retirement account
• Individual Savings Account
• individualisation
• individualise
• individualised
• individualism
• individualist
• individualistic
• individualistically
• individuality
• individualization
• individualize