All 3 Uses of

prodigal
in
Utopia, by Thomas More

This, indeed, is the only instance of their frugality, for in all other things they are prodigal, even to the beggaring of themselves; but, besides this, they carry about with them a great number of idle fellows, who never learned any art by which they may gain their living; and these, as soon as either their lord dies, or they themselves fall sick, are turned out of doors; for your lords are readier to feed idle people than to take care of the sick; and often the heir is not able to keep together so great a family as his predecessor did.†
*

Their skill in military affairs increases their courage: and the wise sentiments which, according to the laws of their country, are instilled into them in their education, give additional vigour to their minds: for as they do not undervalue life so as prodigally to throw it away, they are not so indecently fond of it as to preserve it by base and unbecoming methods.†

Is not that government both unjust and ungrateful, that is so prodigal of its favours to those that are called gentlemen, or goldsmiths, or such others who are idle, or live either by flattery or by contriving the arts of vain pleasure, and, on the other hand, takes no care of those of a meaner sort, such as ploughmen, colliers, and smiths, without whom it could not subsist?†

Definitions:

(1) (prodigal)
recklessly wasteful

or more rarely:

abundant (extravagant in amount)

or more rarely still:

long absent (someone who has been away a long time)
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

More rarely, prodigal is used as a noun as a shortened version of prodigal son to reference someone who is wasteful like the prodigal son in the famous Christian parable. When the prodigal son came home and apologized for his wasteful and ungrateful ways, his father forgave him, loved him, and celebrated the return.