The Collaborative International Dictionary of English v.0.48:

Vagrant \Va"grant\, a. [Probably fr. OF. waucrant, wacrant, p.
   p. of waucrer, wacrer, walcrer, to wander (probably of
   Teutonic origin), but influenced by F. vagant, p. pr. of
   vaguer to stray, L. vagari. Cf. Vagary.]
   [1913 Webster]
   1. Moving without certain direction; wandering; erratic;
      unsettled.
      [1913 Webster]

            That beauteous Emma vagrant courses took. --Prior.
      [1913 Webster]

            While leading this vagrant and miserable life,
            Johnson fell in love.                 --Macaulay.
      [1913 Webster]

   2. Wandering from place to place without any settled
      habitation; as, a vagrant beggar.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vagrant \Va"grant\, n.
   One who strolls from place to place; one who has no settled
   habitation; an idle wanderer; a sturdy beggar; an
   incorrigible rogue; a vagabond.
   [1913 Webster]

         Vagrants and outlaws shall offend thy view. --Prior.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vagrant
    adj 1: continually changing especially as from one abode or
           occupation to another; "a drifting double-dealer"; "the
           floating population"; "vagrant hippies of the sixties"
           [syn: aimless, drifting, floating, vagabond,
           vagrant]
    n 1: a wanderer who has no established residence or visible
         means of support [syn: vagrant, drifter, floater,
         vagabond]

Moby Thesaurus II by Grady Ward, 1.0:

216 Moby Thesaurus words for "vagrant":
   Arab, Bowery bum, aberrant, aberrative, adrift, afloat, aimless,
   alternating, amorphous, arbitrary, beach bum, beachcomber, beggar,
   beggarly fellow, blighter, bo, budmash, bum, bummer, caitiff,
   capricious, changeable, changeful, circuitous, circumforaneous,
   cranky, crotchety, departing, derelict, desultory, deviable,
   deviant, deviating, deviative, deviatory, devil, devious,
   digressive, discursive, divagatory, dizzy, dogie, drifter,
   drifting, drunkard, eccentric, errant, erratic, excursive,
   fanciful, fantasied, fantastic, fast and loose, fickle, fitful,
   flaky, flickering, flighty, flitting, floating, fluctuating,
   footloose, footloose and fancy-free, freakish, fugitive, gadding,
   gamin, gamine, giddy, good-for-naught, good-for-nothing,
   guttersnipe, gypsy-like, gypsyish, harebrained, hobo,
   homeless waif, human wreck, humorsome, idler, impetuous, impulsive,
   inconsistent, inconstant, indecisive, indirect, infirm, irregular,
   irresolute, irresponsible, kinky, labyrinthine, landloper,
   landloping, lazzarone, loafer, losel, lowlife, maggoty,
   mauvais sujet, mazy, mean wretch, meandering, mercurial,
   migrational, migratory, moody, motiveless, mucker, mudlark,
   no-good, nomad, nomadic, notional, out-of-the-way, pauvre diable,
   perambulatory, peripatetic, petulant, piker, pilgarlic, planetary,
   poor creature, poor devil, quirky, ragamuffin, ragman, ragpicker,
   rambling, ranging, restless, roaming, rounder, roving, sad case,
   sad sack, sauntering, scatterbrained, serpentine, shapeless,
   shifting, shifty, shuffling, ski bum, skid-row bum, snaky,
   spasmodic, spineless, stiff, straggling, stray, straying,
   street Arab, street urchin, strolling, sundowner, surf bum,
   swagman, swagsman, swerving, tatterdemalion, temperamental,
   tennis bum, traipsing, tramp, transient, transitory,
   transmigratory, truant, turning, turnpiker, twisting,
   unaccountable, uncertain, uncontrolled, undependable, undirected,
   undisciplined, unfixed, unpredictable, unreasonable, unreliable,
   unrestrained, unsettled, unstable, unstable as water, unstaid,
   unsteadfast, unsteady, urchin, vacillating, vag, vagabond,
   vagarious, variable, vaurien, veering, vicissitudinary,
   vicissitudinous, volatile, waif, waifs and strays, wandering,
   wanton, wastrel, wavering, wavery, wavy, wayfaring, wayward,
   whimsical, winding, wishy-washy, worthless fellow, wretch,
   zigzag