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1) One who is no longer able to use his/her mind.

2) Not effectual; void.
1) The disease turned Marty into an invalid before killing him; we miss him dearly.

2) The ticket is invalid west of the Mississippi, though, so choose carefully.
by Diggity Monkeez April 08, 2005
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2
Inconsistent with some web programmer's arbitrary and frequently incorrect notion of how the world should be.
A: Why does that web site say that your university is in England when it is really in Sweden?

B: Because when I enter the correct address, the web site rejects the postal code as 'invalid'.
by P J Wonko March 14, 2013
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3
Someone with a lack of possibility. Otherwise known as a moron.

Refer to examples such as jeremy's face or shahpur's arguments.

Person1: Your face is invalid.
Jeremy: What?
Person1: Point proven

Shahpur: I am epic
Person1: o really?
Shahpur: I walked in uber cold weather without gloves or scarf for 30 mins
Person1: I walked in uber hot weather without gloves or scarf

Person1 = WIN
Shahpur = INVALID
by s3xy_c4t December 07, 2008
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4
1. When someone says something completely irrevelant to the convo.

2. When someone says something completely stupid in a convo

1. A "you goin to the concert?
B "Yh, gonna get sum kfc"
A "INVALID!?!? wtf

2. A "yh dat was of da hook yo!"
B."it was very elegant"
A. Invalid
by badda trims April 20, 2006
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5
A person incapable of doing things for him or herself, also known as a turd
Mom: Let me drive you to work!
Girl: No thanks, Mom. I'm not an invalid.
Mom: Please, let me help you with something!
Girl: I'M NOT AN INVALID
by Katy Schmieds April 22, 2015
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6
N. An individual who is unable to communicate.
My boss is an invalid who speaks over others, or at others, but not with others.
by Her 2 January 27, 2018
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