invalid
Intermediate (B1)
IPA: /ɪnˈvælɪd/
KK: /ɪnˈvælɪd/
adjective
Definition
Not valid or acceptable; something that is incorrect or not based on sound reasoning.
Example
The contract was declared invalid because it was not signed by both parties.
Conversation
Did you hear about the new parking regulations?
Yeah, I saw the signs, but some of them seem invalid.
Exactly! I don’t think they can just change the rules without notice.
Right? It feels like they're just trying to confuse people.
Synonyms & Antonyms
Synonyms
faulty
null
sickly
Antonyms
valid
sound
healthy
noun
Definition
A person who is unable to care for themselves due to a long-term illness or disability.
Example
The charity provides support for invalids who need assistance with daily activities.
Conversation
Did you hear about the new support group for invalids?
Yeah, I heard it's a great place for people with disabilities to connect.
I think it's really nice that they're creating a space for the invalid community.
transitive verb
Definition
To release someone from duty or service due to illness or injury, often used in a military context.
Example
He was invalided out of the army after his injury.
Tense Forms
Past: invalided
Past Participle: invalided
Conversation
Did you hear that Tom was invalid from the army due to his injury?
Yeah, I heard that too; it’s really unfortunate.
I can't believe he was invalid so suddenly after all that training.
Root Explanation
Invalid → It is formed from "in-" (meaning not) and "validus" (meaning strong or effective). The word "invalid" means not strong or not effective, often used to describe something that is not legally acceptable or recognized.
Memory Tip
Think of 'not' ('in-') and 'strong' ('validus') to remember that 'invalid' means something that is not strong or effective.
Visually Confused Words
unvalid
valid