dreadly adjective 1adverb 1forms 2 adjective1 •(no longer used) dreadfulAt thy approach, black shades did vanish, / And from my heart thou feare didst banish, / And in their room did light appear, / And joy instead of dreadly feare. — 1652 adverb1 •(no longer used) With dread.So shall you see a Cloud-crown'd Hill somtime, / Torn from a greater by the waste of Time; / Dreadly to shake, and boundling down to hop, / And roaring, here it roules tall Cedars up — 1641 formsmore dreadly · most dreadly