Adjektive
treacherous {feelings & emotions}, [ more treacherous ; most treacherous ]
perfidious [ more perfidious ; most perfidious ]
unfaithful {feelings & emotions}, [ more unfaithful ; most unfaithful ]
disloyal {feelings & emotions}
faithless {feelings & emotions}, [ more faithless ; most faithless]
treasonous {feelings & emotions}
unreliable {feelings & emotions}
untrue {feelings & emotions}