Without cost or expense; in a manner that requires no payment.
From 'costless' plus the adverb suffix '-ly.' A combination of two productive English suffixes that builds an adverb from the adjective 'costless.'
Adding '-ly' to '-less' words creates adverbs that feel more formal and abstract than the base adjective—'costlessly' sounds more economically sophisticated than just saying 'for free.'
Complete word intelligence in one call. Free tier — 50 lookups/day.