The guide treacherously led the hikers away from the safe trail into the fog.

Her treacherous actions betrayed the trust the team had placed in her.

They whispered that he was a treacher, selling secrets to the enemy.

Villagers whispered that treachers lurked in the fog near the marsh.

The captain's treacherousness cost the crew their trust and nearly their lives during the storm.

After learning that the estate had been left to Treacher, Maria felt both honored and overwhelmed.

After his diagnosis with Treacher Collins syndrome, he joined a support group for families affected by rare craniofacial conditions.