1. Not endowed with reason.
2. Unsound, illogical, unreasonable, not based on reality, nonsensical, foolish.
3. Affected by loss of usual or normal mental clarity; incoherent, as from a shock.

‘Irrational’ is pretty easy to remember as it can be broken down into ‘Ir + rational’ which would mean something that is not rational.

1. His father became more irrational as his fever got worse.
2. Some politicians become irrational in the way they spend and waste money.
3. Rajesh tends to be more irrational every day as a result of her demented condition.

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