Homicidal means driven by an urge to murder people. A homicidal rage, homicidal tendencies, a homicidal maniac.
The phrase homicidal maniac belongs to fiction and to headlines rather than to medicine, and it does real harm: people with mental illness are far likelier to be attacked than to be homicidal. Homicide is the neutral legal word for a killing.
1adjectivehomicidalDriven by an urge to murder people.
“The film's villain is a homicidal doctor who secretly poisons his patients.”
homicidal is a state.
Latin
homicīda — man-slayer
Old French
homicide
English
homicide
English, today
homicidal
Built from
From homicide + -al. homicide comes from Old French homicide, from Latin homicīda (“man-slayer”) and homicīdium (“manslaughter”).
Etymology from Wiktionary, CC BY-SA