An invalid argument is when the facts you are using are invalid or your forms of defense are wrong or incorrect, a valid argument is the opposite of an invalid argument.
"There is a windmill in my beard. your argument is invalid."
(This is a good example of a bad contradiction)
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An invalid argument does not make sense logically. The statements in the argument are not connected in a rational way. A sound argument must not only be valid (logically connected) but also based on true premises. Therefore an argument may be unsound because it makes no logical sense, because the premises are flawed, or both.
poor wording ???
A valid deductive argument will have a valid premise and conclusion and a fallacy may be true, it all matters on how you came to the conclusion.
The opposite would be non-valid, invalid, or void.
A valid credit card number is a card that is recognized as real and usable. An invalid card is either expired or falsified.