bountiful (adj.)

late 13c., "a gift, a reward, a favor bestowed freely;" c. 1300, "goodness, virtue; beauty; ; excellence; knightly prowess, strength, valor, chivalry," early 14c., "a helpful act, an act of generosity, a good deed," also "liberality in giving, generosity, munificence," from Anglo-French bountee, Old French bonte "goodness" (12c., Modern French bonté), from Latin bonitatem (nominative bonitas) "goodness," from bonus "good" (see bonus).

The sense of "gift bestowed by a sovereign or the state" led to the extended senses of "premium or gratuity to a military recruit" (1702) and "reward for killing or taking a criminal or enemy" (1764) or dangerous animal (1847).

Bounty-jumper "one who enlists in the military, collects the bounty, and flees without reporting for duty" is from the American Civil War (by 1864). Bounty-hunter is from 1893, American English, originally in reference to wild animals.

I do ... promise, that there shall be paid ... the following several and respective premiums and Bounties for the prisoners and Scalps of the Enemy Indians that shall be taken or killed .... ["Papers of the Governor of Pennsylvania," 1764]

late 14c., bounteuous, bountevous, from Old French bontieus, bontive; see bounty + -ous. Originally "full of goodness to others," but since c. 1400 shading toward "generous in bestowing," a sense which logically might have been left to bountiful. Related: Bounteously; bounteousness.

word-forming element attached to nouns (and in modern English to verb stems) and meaning "full of, having, characterized by," also "amount or volume contained" (handful, bellyful); from Old English -full, -ful, which is full (adj.) become a suffix by being coalesced with a preceding noun, but originally a separate word. Cognate with German -voll, Old Norse -fullr, Danish -fuld. Most English -ful adjectives at one time or another had both passive ("full of x") and active ("causing x; full of occasion for x") senses.

It is rare in Old English and Middle English, where full was much more commonly attached at the head of a word (for example Old English fulbrecan "to violate," fulslean "to kill outright," fulripod "mature;" Middle English had ful-comen "attain (a state), realize (a truth)," ful-lasting "durability," ful-thriven "complete, perfect," etc.).