Wiktionary
boasteth
vb. (context archaic English) Third-person singular present simple form of '''boast'''
Usage examples of "boasteth".
I you beseech, that of your courtesy, Since ye have heard this false Friar lie, As suffer me I may my tale tell This Friar boasteth that he knoweth hell, And, God it wot, that is but little wonder, Friars and fiends be but little asunder.