noiselessly
adverb C2
Plain meaning
without making any sound
Exam-register meaning
In formal or high-level texts, it is used to describe without making any sound, often with a precise or specialised tone.
In context
naturalThe system improved noiselessly after the update.
examResources must be allocated noiselessly if the programme is to remain sustainable.
Common collocations
act noiselesslychange noiselesslyperform noiselessly
Watch out
Do not place “noiselessly” randomly in the sentence; adverbs usually need a clear verb or whole-clause meaning.