Costlessly is a derived term of costless.
Costlessly is a related term of costless.
As an adjective costless
is having no cost.
As an adverb costlessly is
without cost.
costless
English
Adjective
(-)
having no cost
Synonyms
* free
Antonyms
* costly
Derived terms
* costlessly
costlessly
English
Adverb
(-)
without cost
Synonyms
* freely
Antonyms
* costly
Related terms
* cost
* costless