be of sound mind

be of sound mind

1. To have full, unimpaired thought, memory, and cognitive understanding; able to think and understand for oneself. My grandfather may be in a wheel-chair at 94, but he's still of sound mind—sharper than a lot of people I know, actually!
2. law By extension, to be fully mentally competent and thus able to stand trial or be otherwise legally responsible. The state-appointed psychiatrist determined that the defendant was not of sound mind when signing the contract, and thus is not legally bound to honor the terms therein.
See also: mind, of, sound
Farlex Dictionary of Idioms.
See also:
  • of sound mind
  • be of unsound mind
  • keep (someone or something) in sight
  • keep in sight
  • keep sight of
  • keep sight of (someone or something)
  • keep sight of somebody/something
  • put (oneself) at (one's) ease
  • wash your hands of
  • wash your hands of something/someone