1. Not practical; not workable or not given to practical matters
   "refloating the ship proved impractical because of the expense"; "he is intelligent but too impractical for commercial work"; "an impractical solution" 
2. Not practical or realizable; speculative
   - airy, visionary, Laputan, windy

See also: crazy, half-baked, impossible, impracticality, meshuga [N. Amer], meshugga [N. Amer], meshugge [N. Amer], meshuggeneh [N. Amer], meshuggener [N. Amer], practicality, quixotic, romantic, screwball, softheaded, unfunctional, unrealistic, unwieldy, utopian, wild-eyed

Antonym: practical

• colour tube
• colour TV
• colour TV tube
• colour vision
• colour vision deficiency
• colour wash
• colour wheel
• colour-blind
• colour-blind person
• colourant
• colouration
• colourcast
• coloured
• coloured audition
• coloured hearing
• colourfast
• colourful
• colourfully
• colouring
• colouring book
• colouring material
• colourise
• colourist
• colourize
• colourless