unfastening
1. [ noun ] loosening the ties that fasten something
Synonyms: undoing untying
Examples:

"the tying of bow ties is an art the untying is easy"

Related terms: loosening unfasten loosen
Similar spelling:   unfasten
  unfastener
  unfastened
  unbiased
  unpasteurized
  unpasteurised
  unfaceted
  unbiassed