unuseful

From un- +‎ useful.

• (UK) IPA^(key): /ʌnˈjuːsfəl/

unuseful (comparative more unuseful, superlative most unuseful)

1. Not useful; useless.
   • 1630, John Smith, True travels, in Kupperman 1988, p. 47:

     in regard of the situation of this strong Fortresse, they did neither feare them nor hurt them, being upon the point of a faire promontory, environed on the one side within halfe a mile with an un-usefull mountaine, and on the other side with a faire Plaine […]

   • 2011, Anne Armstrong, Awakening the Divine Within (page 81)

     If it is deemed to be unuseful, attempt to terminate the action or reverse the impact as much as possible. If it is a useful action compliment yourself and smile inwardly.

• useless

• useful