unjustifiable 

Can't be justified

Killing a beautiful lion is unjustifiable. Can't be justified

unjustifiable by johnbclay September 12, 2015

Unburstifiable 

Something that cannot be burst. Impossible to pop. Indefatigable and indestructible. Period. No woman joke intended.

Mika's bubble was unburstifiable.

They tried to burst his bubble, but rihanna could not be popped.

Unburstifiable by MiLo September 12, 2012