Definition of singly :
1. Honestly; sincerely; simply.
2. Individually; particularly; severally; as, to make men singly and personally good.
3. Only; by one's self; alone.
4. Singularly; peculiarly.
5. Without partners, companions, or associates; single- handed; as, to attack another singly.
only, apart, single-handedly, singularly, by the piece, solitarily, alone, privately, by itself, respectively, one by one, individually, solo, severally, one after another, by oneself, solely, once, discretely, separately, on an individual basis, one at a time, independently, include
unitedly (part of speech: adverb)
congruously, completely, purely, indivisibly, homogeneously, coherently, entirely, atomically, congruently, elementally, solidly, holistically, fundamentally, cohesively, unitedly, integrally, simply, coincidentally
- They met in Silver City, coming in singly. - "The Red-Blooded Heroes of the Frontier", Edgar Beecher Bronson.
- I have described the dangers in which these ships were involved owing to the fact that the groups were obliged to break up after entering the Channel and the Irish Sea, and thus to proceed singly to their destinations. - "The Victory At Sea", William Sowden Sims Burton J. Hendrick.
- Misfortunes, they say, never come singly, and- would you believe it, my dear? - "The Mayor of Troy", Sir Arthur Thomas Quiller-Couch.