All 4 Uses of

wanton

in

Henry IV, Part 1

She bids you on the wanton rushes lay you down, And rest your gentle head upon her lap, And she will sing the song that pleaseth you, And on your eyelids crown the god of sleep, Charming your blood with pleasing heaviness; Making such difference betwixt wake and sleep, As is the difference betwixt day and night, The hour before the heavenly-harness'd team Begins his golden progress in the East.†
Scene 3.1

All furnish'd, all in arms; All plumed like estridges that with the wind Bate it; like eagles having lately bathed; Glittering in golden coats, like images; As full of spirit as the month of May And gorgeous as the Sun at midsummer; Wanton as youthful goats, wild as young bulls.†
Scene 4.1

But in short space It rain'd down fortune showering on your head; And such a flood of greatness fell on you,— What with our help, what with the absent King, What with the injuries of a wanton time, The seeming sufferances that you had borne, And the contrarious winds that held the King So long in his unlucky Irish wars That all in England did repute him dead,— And, from this swarm of fair advantages, You took occasion to be quickly woo'd To gripe the general sway into your hand; Forgot your oath to us at Doncaster; And, being fed b†
Scene 5.1

So much misconstrued in his wantonness.
Scene 5.2 *

wantonness = recklessness (thoughtless indulgence)

Definitions:

(1) (wanton)
of something considered bad: excessive, thoughtless indulgence -- such as waste, cruelty, violence, and (especially in the past) sexual promiscuity
(2) (meaning too rare to warrant focus)
In classic literature, wanton can also describe people who are playful or plants that are growing profusely.