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perfidious

adjective

/pərˈfɪdiəs/

Meaning

deceitful and untrustworthy

The spy was executed for his perfidious actions.

treacherous, deceitful, disloyal, unfaithful, duplicitous

loyal, faithful, trustworthy

perfidious act, perfidious betrayal, perfidious nature

large or noticeable enough to be important

Skillful at using underhanded tactics to achieve goals; not straightforward.

Of exceptional strength, size, or power.

Not engaging in activity; not active.

having or showing experience, knowledge, and good judgment

Quick and light in movement or thought.