"cruelest" in the adjective sense
1. barbarous, brutal, cruel, fell, roughshod, savage, vicious
of persons or their actions) able or disposed to inflict pain or suffering
"a barbarous crime"
"brutal beatings"
"cruel tortures"
"Stalin's roughshod treatment of the kulaks"
"a savage slap"
"vicious kicks"
Source: WordNet® (An amazing lexical database of English)
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