A person who is considered very stupid or foolish; someone who makes obviously bad decisions.
From Greek 'moros' meaning 'dull' or 'foolish.' The term was originally used in psychology in the early 1900s to classify people with intellectual disabilities, but is now considered offensive and outdated for that use.
This word is a perfect example of how insults evolve—it started as clinical medical terminology and became a slur, which is why many people avoid it today even though it's still used casually in speech. The journey of 'moron' from a scientific term to a taboo word shows how language reflects changing social values.
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