grand, stately, secure, lasting
巋 centers on imposing, enduring solidity: something grand and stately that stands secure and lasting, like a towering mountain.
巋 combines 山 (mountain) with 歸, which likely contributes the sound and the idea of returning or gathering, suggesting a mountain that stands firm and enduring.
A mountain (山) that returns (歸) to the same shape every day: grand, stately, secure, and lasting.
For キ, imagine a grand, secure key (キー) carved into the mountain: key -> キ, and it locks in the lasting strength.
soaring highly; towering greatly