The Collaborative International Dictionary of English v.0.48:
single-handed \sin"gle-hand"ed\, a. Having but one hand, or one workman; also, alone; unassisted. [1913 Webster]WordNet (r) 3.0 (2006):
single-handed adv 1: without assistance; "I built this house single-handedly" [syn: single-handed, single-handedly] adj 1: unsupported by other people [syn: single-handed, unassisted, unbacked] 2: without help from others; "a single-handed accomplishment"