As adjectives the difference between loony and bonkers
is that loony is insane while bonkers is irrational, crazy.
As a noun loony
is an insane or very foolish person.
loony
English
Alternative forms
* (insane) luny, looney
Adjective
(er)
(of a person) Insane.
(of a thing) Very silly, absurd.
Synonyms
* See also
Noun
(loonies)
An insane or very foolish person.
bonkers
English
Adjective
(head)
(informal) irrational, crazy