illogical
adjective/i.lu.ˈʒi.ku/medium
i·ló·gi·co
Definition
Not following the principles of logic; contrary to reason or common sense.
His reaction was completely illogical, given the context.
It is illogical to expect different results without changing the methods.
Common collocations
illogical argumentillogical conclusionillogical behaviour
Etymology
Do prefixo negativo 'i-' (do latim 'in-') + 'lógico', do grego 'logikós'.