Source : Webster's Revised Unabridged Dictionary (1913)

Changeless \Change"less\, a.
   That can not be changed; constant; as, a changeless purpose.
   -- {Change"less*ness}, n.

Source : WordNet®

changeless
     adj 1: not subject or susceptible to change or variation in form or
            quality or nature; "the view of that time was that all
            species were immutable, created by God" [syn: {immutable}]
            [ant: {mutable}]
     2: persistent in occurrence and unvarying in nature;
        "maintained a constant temperature"; "a constant beat";
        "principles of unvarying validity"; "a steady breeze"
        [syn: {constant}, {invariant}, {steady}, {unvarying}]
     3: remaining the same for indefinitely long times [syn: {unalterable}]