The Collaborative International Dictionary of English v.0.48:

Homeless \Home"less\, a. [AS. h[=a]mleas.]
   Destitute of a home. -- Home"less*ness, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

homeless \home"less\, n. pl.
   Those people who have no permanent residence, especially
   those who live outdoors due to poverty; usually used in the
   definite phrase the homeless.

WordNet (r) 3.0 (2006):

homeless
    adj 1: without nationality or citizenship; "stateless persons"
           [syn: homeless, stateless]
    2: physically or spiritually homeless or deprived of security;
       "made a living out of shepherding dispossed people from one
       country to another"- James Stern [syn: dispossessed,
       homeless, roofless]
    n 1: someone unfortunate without housing; "a homeless was found
         murdered in Central Park" [syn: homeless, homeless
         person]
    2: poor people who unfortunately do not have a home to live in;
       "the homeless became a problem in the large cities"

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "homeless":
   abandoned, alienated, alone, aloof, apart, bankrupt, bums,
   companionless, defenseless, derelict, deserted, desolate,
   destitute, detached, down-and-out, exiled, fatherless, forlorn,
   forsaken, fortuneless, friendless, godforsaken, helpless,
   houseless, in the gutter, in the red, insolvent, insular, isolated,
   kithless, landless, lone, lonely, lonesome, moneyless, motherless,
   out of funds, outcast, penniless, propertyless, removed, rootless,
   separate, separated, single-handed, solitary, solo, stateless,
   unabetted, unaccompanied, unaided, unassisted, unattended,
   unescorted, unestablished, unfriended, unharbored, unhoused,
   unplaced, unseconded, unsettled, unsupported, vagabond, withdrawn,
   without a sou