1. Producing no result or effect
   "an unavailing attempt"
   - futile, ineffectual, otiose

See also: useless

• this
• this evening
• this night
• thistle
• thistledown
• thistlelike
• thistly
• thither
• thitherto
• thitherward
• thixotropic
• thixotropy
• Thlaspi
• Thlaspi arvense
• ThM
• tho'
• thole
• tholepin
• Thomas
• Thomas a Becket
• Thomas a Kempis
• Thomas Alva Edison
• Thomas Aquinas
• Thomas Augustus Watson
• Thomas Babington Macaulay