invalid
invalid Lexical Profile
invalid Game Scores & Validity
• adjective
Legally or officially unacceptable, null, or without binding force, often because a formal requirement or expiration date has not been met.
"The border officer informed him that his passport was invalid because it had expired the previous month."
Not logically sound, true, or well-founded because of flawed reasoning or false premises.
"The researchers concluded that the original hypothesis was invalid after new experimental data contradicted its core assumptions."
Suffering from or intended for people with chronic illness, weakness, or disability.
"During the nineteenth century, wealthy families often traveled to coastal resorts for the benefit of invalid relatives."
• noun
A person made weak or disabled by a prolonged illness or injury, requiring ongoing care.
"In the novel, the protagonist spends her summers reading aloud to her elderly aunt, who had lived as an invalid for decades."
• verb
British To remove someone from active military service or employment because of illness or injury.
"After contracting a severe tropical fever abroad, the young officer was invalided home to recover."
Word Nuance & Usage
"Invalid" is a heteronym: when meaning "not legally or logically sound," it is stressed on the second syllable (in-VAL-id); when referring to a chronically ill or disabled person, it is stressed on the first syllable (IN-vuh-lid) and is now considered dated or potentially offensive in modern usage.
• Rhymes for invalid
• Nearby Words
Word Origin & Etymology
Borrowed in the mid-16th century from Latin invalidus ('not strong, weak, ineffective'), formed from the negative prefix in- ('not') and validus ('strong'), from the verb valere ('to be strong').