unhelpered
adjective
Without a helper; singlehanded; solitary.
Examples:
I wouldn't dare do it myself unhelpered! It may be necessary to hold the highborn master, lest the crushed flesh beside his mouth should bypass. (Context: In her archaic language, Grandma Estela seeks help with using a mincer to force-feed a skinny boy. Source: J∙ Okram - The Mystery of the Rammed Key.)