arithmetic series (noun) arithmetic progression: arithmetic sequence
Sinonime: atrocity, barbarism, barbarity, bloodthirstiness, brutishness, choke hold, cruelty, ferocity, fierceness, grossness, inhumanity, ruthlessness, sadism, savageness, savagery, third degree, unfeelingness, viciousness
Antonime: gentleness, humaneness, kindness, niceness