irrational

Not endowed with reason.

Affected by loss of usual or normal mental clarity; incoherent, as from shock.

Marked by a lack of accord with reason or sound judgment.

Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern.

Being a metric foot containing such a syllable.

Of or relating to an irrational number.

An irrational number.

A prime number.