imbrevious 

(adj.) incapable of direct speech or succinctness as characterized by an inflated sense of intellect and or arrogant desire to hear the sound of one's own voice.

The keynote speaker was particularly imbrevious, and thusly, meeting attendees were delayed from lunch.

imbrevious by DelRayRunner June 19, 2010

impervious 

im-pur-vee-uhs
not permitting penetration or passage; impenetrable, incapable of being injured or impaired:

The coat is impervious to rain, wear, and tear.

impervious by Dani W June 16, 2008

Impervious 

When applied to girls: the quality of being unaware of - or otherwise unaffected by - blatant perving.

Gavin: (staring at Karen's breasts) Wow you have beautiful eyes.
Karen: Aw, you're so sweet.
Onlooker: Karen is totally impervious.

Impervious by PearlFly January 28, 2013

imperviousness to tanks 

The inability to be killed or harmed by the means of a tank or other large war machine designed to destroy

Fred, having an imperviousness to tanks, simply walked infront of it.

imperviousness to tanks by MrSam July 19, 2006