Antonyms for the word ‘rational’ include terms like ‘irrational’, ‘unreasonable’, and ‘illogical’.
To elaborate, ‘irrational’ refers to actions or thoughts that lack logic or reason, often influenced by emotions rather than sound judgment. ‘Unreasonable’ indicates a lack of fairness or common sense in judgment, while ‘illogical’ refers to conclusions that are not based on coherent or valid reasoning. In contrast to ‘rational’, which denotes logical thinking and sound judgment, these antonyms highlight a deviation from clear reasoning.