bountiful (adj.)youdaoicibaDictYouDict[bountiful 词源字典]
late 15c., from bounty + -ful. Related: Bountifully.[bountiful etymology, bountiful origin, 英语词源]
largely (adv.)youdaoicibaDictYouDict
c. 1200, "liberally, generously, bountifully;" also "in large measure; abundantly," from large + -ly (2). Meaning "extensively, to a great extent" is c. 1400.