Firmly established or unlikely to change; inveterate.
Inured; toughened.
Having extra defences against attack; highly fortified.
Unfeeling; pitiless; callous.
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.