mandatory (adjective) mandatory: required, necessary
Sinonime: adulterine,
cheating, deceitful, double-crossing, faithless, false, false-hearted,
fickle, foresworn, inconstant, incontinent, moonlighting, not true to, of bad faith, perfidious, philandering, recreant, shifty, snaky, sneaking, traitorous, treacherous, treasonable, two-faced, two-timing, unchaste, unreliable, untrue, untrustworthy,
wickedAntonime: faithful, loyal,
trustworthy