Not rational; unfounded or nonsensical.
Of a real number, that cannot be written as the ratio of two integers.
A real number that can not be expressed as the quotient of two integers, an irrational number.
Having properties which are counterintuitive or difficult to handle.
Relating to, amounting to, causing, or caused by a physical or mental disorder.
Pertaining to pathology.
Having properties that cause unusually bad behaviour, especially regarding correctness or performance.