perfidious in Bulgarian
perfidious in Bulgarian
коварен
Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance. [from late 16th c.]
вероломен
Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance. [from late 16th c.]
предателски
Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance. [from late 16th c.]