adj. without the help, aid or assistance of someone or something
The Century Dictionary and Cyclopedia
Not aided; not assisted.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. carried out without aid or assistance
Word Usage
"Assume for example that they did 3 excellent, methodologically sound studies on this topic and 2 of them indicated “zero increase in unaided recall”."