crazy
cra-zy
adjective
Extremely enthusiastic or passionate about something or someone.
"She's crazy about horses and spends hours riding."
adjective
Suffering from a serious mental illness; not sane or rational.
"He went completely crazy after the accident."
adjective
Extremely foolish, impractical, or absurd; lacking common sense.
"That's a crazy idea, it will never work."
Thesaurus
Synonyms: screwball, half-baked, impractical, softheaded, unbalanced, brainsick, disturbed, demented, unhinged, insane, sick, mad