1) Eminent 2) High 3) Impressively high 4) Lofty 5) Of imposing height 6) Of impressive height 7) Soaring 8) Tall and impressive Found on https://www.crosswordclues.com/clue/towering
Tow'er·ing adjective 1. Very high; elevated; rising aloft; as, a towering height. Pope. 2. Hence, extreme; violent; surpassing. « A man agitated by a towering passion.» Sir W. Scott. Found on http://www.encyclo.co.uk/webster/T/77