Synonyms: lunatic, madman, maniac
Definition: an insane person
Similar words: sick person, diseased person, sufferer
Definition: a person suffering from an illness
Synonyms: maniac
Definition: a person who has an obsession with or excessive enthusiasm for something
Similar words: fancier, enthusiast
Definition: a person having a strong liking for something
Definition: wildly disordered
Usage: a maniacal frenzy
Similar words: insane
Definition: afflicted with or characteristic of mental derangement
Usage: was declared insane; insane laughter