The One who is most steadfast and solid. The One whose strength produces certitude.
“I have only created Jinns and men, that they may serve Me. No Sustenance do I require of them, nor do I require that they should feed Me. For Allah is He Who gives (all) Sustenance, – Lord of Power – STEADFAST (FOREVER).”
(51:56…58) The Holy Quran

From the root m-t-n with the classical Arabic connotations: to be strong, firm, hard to be solid, steadfast, sure the hard outer or apparent part of something elevated and hard ground.
Allah is most steadfast and solid. The One whose strength produces certitude.
He is loyal, firm and constant. His nature is the utmost firmness and steadfastness.
He can easily overcome anything through supreme firmness and strength of determination.
