nuts-and-bolts (adjective) rudimentary: basic, fundamental
Sinonime: animality, barbarism, barbarity, bestiality, bloodthirstiness,
brutality, brutishness, callousness, coarseness, coldness,
depravity, despotism, ferocity, fiendishness, fierceness, hard-heartedness, heartlessness, inhumanity, insensibility, insensitiveness, malice, malignity, masochism, mercilessness, murderousness,
persecution, rancor, ruthlessness, sadism, savageness, savagery,
severity, spite, spitefulness,
torture, truculence, unfeelingness, unkindness, venom, viciousness, wickedness
Antonime: additional,
advanced,
derivative,
developed,
extra, nonessential