Source : Webster's Revised Unabridged Dictionary (1913)

Single-handed \Sin"gle-hand"ed\, a.
   Having but one hand, or one workman; also, alone; unassisted.

Source : WordNet®

single-handed
     adj 1: unsupported by other people [syn: {unassisted}, {unbacked}]
     2: without help from others; "a single-handed accomplishment"

single-handed
     adv : without assistance; "I built this house single-handedly"
           [syn: {single-handedly}]