single-handed
adverb
ukus (also single-handedly)
without help from anyone else:
He turned the business around virtually single-handed.
Google was almost single-handedly responsible for making advertising on the internet successful.
single-handed
adjective
uk/ˌsɪŋɡlˈhændɪd/ usdone without help from anyone else:
The trucking company took single-handed control of most of the 6,500 independent truckers that service Los Angeles.