mad·cap 
(mădkăp′)
(mădkăp′)adj.
Behaving or acting impulsively or rashly; wild.
[MAD + CAP1, head.]
madcap′ n.
- internuncial
- internuncially
- internuncio
- interoceptive
- interoceptor
- interoffice
- interoperability
- interoperable
- interpeduncular
- interpenetrate
- interpersonal
- interpersonally
- interphase
- interphone
- interplanetary
- interplay
- interplead
- interpleader
- interpolate
- interpolation
- interpolative
- interpolator
- interposal
- interpose
- interposer