ILLOGICAL Meaning of ILLOGICAL in English [il.log.i.cal] adj (1588) 1: not observing the principles of logic 2: devoid of logic: senseless -- il.log.i.cal.i.ty n -- il.log.i.cal.ly adv -- il.log.i.cal.ness n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012