perfidious

English Thesaurus

1. tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans (adj.all)

similar	:	unfaithful,
definition	:	not true to duty or obligation or promises (adj.all)

derivation	:	betrayal, perfidy, treachery, treason,
definition	:	an act of deliberate betrayal (noun.act)

derivation	:	perfidiousness, perfidy, treachery,
definition	:	betrayal of a trust (noun.attribute)

derivation	:	betrayal, perfidy, treachery, treason,
definition	:	an act of deliberate betrayal (noun.act)

derivation	:	perfidiousness, perfidy, treachery,
definition	:	betrayal of a trust (noun.attribute)