ail
Ire
another word for illness is sickness
The word you seek is now a derogatory one - Mad. The word is not used by those who are involved with people with mental health issues as it lacks respect for the individual.
ill-fitting.
Ill
A word that describes a feeling of ill will or anger toward another is "animosity." This term captures the sense of hostility or resentment one might feel towards someone else.
Ill and inn.
Resentment.
ill
ILL ?
Mentally ill.
malaise