Entry 1 sense Webster, 1913 Rankly /(răṉk"ly̆)/ · Rank·ly · IPA 01 adv. With rank or vigorous growth; luxuriantly; hence, coarsely; grossly; as, weeds grow rankly. 1. With rank or vigorous growth; luxuriantly; hence, coarsely; grossly; as, weeds grow rankly.