Scrabble?! IRRATIONAL

Definitions of IRRATIONAL in various dictionaries:

noun - a real number that cannot be expressed as a rational number

adj - not consistent with or using reason

adj - real but not expressible as the quotient of two integers

Not endowed with reason.

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

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.