Definition

1. Adjective Phrase:
   • Mentally competent; sane: The phrase "of sound mind" describes a person whose mental faculties are healthy, complete, and functioning normally. It specifically refers to the ability to think rationally, understand information, and make reasonable decisions.
   • Legally competent: In a legal context, it signifies that a person has sufficient mental capacity to understand the nature and consequences of their actions, such as making a will, signing a contract, or standing trial.

Examples of Usage

• Adjective Phrase:
  • The doctor testified that the elderly woman was of sound mind when she wrote her will.
  • To sign this legal document, you must be of sound mind and of legal age.
  • The court must determine if the defendant is of sound mind before the trial can proceed.

Advanced Usage

• "To be of sound mind and body": A common, more formal expression emphasizing both mental and physical health, often used in legal or official declarations.
  • I declare that I am of sound mind and body when executing this document.

Variants and Related Words

• Soundness (n): The quality or state of being sound, especially in mind or judgment.
  • The soundness of his decision was later proven correct.
• Compos mentis (adj): A Latin legal term directly synonymous with "of sound mind."
• Lucid (adj): Clear-minded, especially during brief periods of clarity.
  • The patient was lucid and able to give consent.

Synonyms

• Sane: Not mentally ill; having a sound, healthy mind.
• Mentally competent: Having the mental ability to understand and act.
• Rational: Based on or in accordance with reason or logic.

Antonyms

• Of unsound mind: The direct legal antonym.
• Non compos mentis: The Latin legal term for not of sound mind.
• Incompetent (legally): Lacking the legal capacity to act.
• Insane: In a state of mind that prevents normal perception, behavior, or social interaction.

Related Idioms and Phrases

• "In one's right mind": Thinking or behaving normally and sensibly. Often used in negative or conditional constructions.
  • No one in their right mind would go out in that storm.
• "To have all one's marbles" (informal): To be sane and mentally alert.
  • At 95, she still has all her marbles.

Adjective

1. of sound mind, memory, and understanding; in law, competent to go to trial