Correct spelling for the English word "galless" is [ɡˈalɛs], [ɡˈalɛs], [ɡ_ˈa_l_ɛ_s] (IPA phonetic alphabet).
Wanting gall or bitterness.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.