The Only Use of

vagrant

in

The Scarlet Letter

It might be that an Antinomian, a Quaker, or other heterodox religionist, was to be scourged out of the town, or an idle or vagrant Indian, whom the white man's firewater had made riotous about the streets, was to be driven with stripes into the shadow of the forest.†
p. 37.4

vagrant = someone who is poor and has no regular home or job

Definitions:

(1) (vagrant)
someone who is poor and has no regular home or job
(2) (meaning too rare to warrant focus)
Less commonly, and especially long ago, you may see vagrant used to emphasize that a poor person wanders from place to place. Even more rarely, it can describe an animal as being in a place it usually is not, or to describe anything that varies or seems random such as the seeming haphazard direction in which a certain weed spreads, or the fleeting quality of something smelled for only an instant.