A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in modern mineralogy it has no technical signification. It is now a rhetorical or poetical name for the embodiment of impenetrable hardness.
Just because an individual in his 30s hasn't found true love and, yes, there are opportunities to date but it also forces you to be more particular. In so many ways, you become more adamant about finding that right person and not allowing yourself to open up to just anybody. Jeff Garcia
The evolution of social media into a robust mechanism for social transformation is already visible. Despite many adamant critics who insist that tools like Facebook, Twitter, and YouTube are little more than faddish distractions useful only to exchange trivial information, these critics are being proven wrong time and again. Simon Mainwaring