Synonyms:
unaided
Meaning: carried out without aid or assistance; "his first unaided walk through the park"
Usage examples
There is none to come to their assistance; and they have not the strength to free themselves unaided.
This discrepancy is quite distinct, but still it is very small, and had two objects been in the heavens at once, the actual Uranus and the theoretical Uranus, no unaided eye could possibly have distinguished them or detected that they were other than a single star.