crack·brain 
(krăkbrān′)
(krăkbrān′)n.
A foolish or eccentric person.
crackbrained′ adj.
- inconsiderably
- inconsiderate
- inconsiderately
- inconsiderateness
- inconsideration
- in consideration of
- inconsistence
- inconsistency
- inconsistent
- inconsistently
- inconsolability
- inconsolable
- inconsolableness
- inconsolably
- inconsonance
- inconsonant
- inconsonantly
- inconspicuous
- inconspicuously
- inconspicuousness
- inconstancy
- inconstant
- inconstantly
- inconsumable
- inconsumably