Lacking sound reasoning or contrary to the principles of logic; not following rational thought patterns. It describes arguments, actions, or ideas that don't make sense or contradict themselves.
From the prefix il- (not) plus logical, which derives from Greek logikos (of or pertaining to reasoning). The term emphasizes the absence of proper logical structure or reasoning processes.
Something illogical doesn't just mean 'wrong' – it means the reasoning process itself is broken! You can have a logical argument with a false conclusion, but an illogical argument fails even if its conclusion happens to be true.
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