亘 (w)

(gèn) extending all the way across; running all the way through

亘古 (w)

(gèngǔ) throughout time; from ancient times (up to the present)

亘古未有 (w)

(gèngǔwèiyǒu) unprecedented; never seen since ancient times

亘古通今 (w)

(gèngǔtōngjīn) from ancient times up to now; throughout history