let-down (noun) betrayal: exhibition of disloyalty
Sinonime: betraying, deceitful,
deceptive, double-crossing, double-dealing, faithless, false,
insidious,
misleading, recreant, shifty,
slick*, snake in the grass, traitorous, two-faced, two-timing, undependable, unfaithful, unloyal, unreliable, untrustworthy
Antonime: faithfulness,
loyalty,
protection,
support