impitoyablement signifie anglais

ruthlessly▼◼◼◼(in a ruthless manner)
adverb
[UK: ˈruːθ.lɪ.sli] [US: ˈruːθ.lə.sli]

inexorably▼(in an inexorable manner; relentlessly)
adverb
[UK: ˌɪn.ˈek.sə.rə.bli] [US: ˌɪ.ˈnek.sə.rə.bli]