Meaning & use
delusional
Believing things that are not true, especially due to a mental condition, or unrealistically optimistic.
See it in a sentence
He seemed delusional, insisting the failed business was actually thriving.
Some fans were delusional about their team's chances of winning the championship.
A note on using this word
Clinically, delusional describes a fixed false belief resistant to evidence; casually, it's often used loosely to mean simply unrealistic or overconfident.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
rationalrealistic
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