Definify.com
Webster 1913 Edition
Darkling
Dark′ling
(därk′lĭng)
, adv.
 [
Dark 
+ the adverbial suffix -ling
.] In the dark. 
[Poetic] 
So, out went the candle, and we were left 
darkling
. Shakespeare
As the wakeful bird
Sings darkling
. Milton.
Dark′ling
,p.
 pr.
 & Adj.
 1. 
Becoming dark or gloomy; frowing. 
His honest brows 
darkling 
as he looked towards me. Thackeray.
2. 
Dark; gloomy. 
“The darkling precipice.” Moore.
 Webster 1828 Edition
Darkling
D'ARKLING
,Adj.
  Definition 2025
darkling
darkling
English
Noun
darkling (plural darklings)
Adjective
darkling (comparative more darkling, superlative most darkling)
-  Dark; darkening.
-  1867, Matthew Arnold, Dover Beach:
- And we are here as on a darkling plain
 - Swept with confused alarms of struggle and flight,
 - Where ignorant armies clash by night
 
 
 -  1867, Matthew Arnold, Dover Beach:
 - obscure; done or happening 'in the dark' or unseen.
 
Adverb
darkling (comparative more darkling, superlative most darkling)
-  In the dark; in obscurity.
-  Shakespeare, King Lear
- So, out went the candle, and we were left darkling.
 
 -  Milton
- As the wakeful bird sings darkling.
 
 
 -  Shakespeare, King Lear
 
Verb
darkling
- present participle of darkle
 
References
- Webster's Seventh New Collegiate Dictionary, Springfield, Massachusetts, G.&C. Merriam Co., 1967