Deceitful

Untrustworthy

Hazardous

Disloyal

Perfidious

Faithless

Risky

Dangerous

1 Synonym: Perfidious

His perfidious actions left a trail of betrayal and mistrust among his colleagues.

The perfidious politician promised reforms but failed to deliver once elected.

She discovered his perfidious nature when she caught him cheating on her.

History is filled with tales of perfidious alliances that ultimately led to downfall.

2 Synonym: Untrustworthy

His untrustworthy behavior caused everyone to doubt his intentions.

She found him untrustworthy after he broke multiple promises.

An untrustworthy source provided false information about the event.

The untrustworthy merchant sold counterfeit goods to customers.

3 Synonym: Hazardous

The workers wore protective gear in the hazardous chemical plant.

Driving in the snowstorm was extremely hazardous for all vehicles.

The minefield was marked as a hazardous area.

Handling hazardous materials requires special training and equipment.

4 Synonym: Disloyal

He felt betrayed by his disloyal friend.

Her disloyal actions caused the team's downfall.

Being disloyal to your family hurts everyone.

Disloyal behavior can destroy even the strongest relationships.