ˈsiŋg(ə)lē, -li adverb
Etymology: Middle English senglely, from sengle single + -ly — more at single
1.
a. : by or with oneself : as an individual person or thing : separately
they come singly or in scattered groups — American Guide Series: Pennsylvania
the tree-living primate mother and her singly born infant — Weston La Barre
b. : without the assistance or support of others : single-handedly
either singly or in cooperation, have carried on noteworthy educational activities — American Guide Series: Oregon
singly and successfully opposed the … proposal for a drastic shortening of hours in industry — Current Biography
2. archaic : as or by a single unit : exclusively , solely
3. : straightforwardly , honestly , sincerely
having its accomplishment singly in mind — F.J.Haskin