duplicitously
/duːˈplɪsɪtəsli/
adverb
- In a deceitful or two-faced manner; with hidden intentions.
- He duplicitously agreed to the plan while secretly working to undermine it.
- She duplicitously complimented her rival's presentation, then later criticized it to the manager.
- The spy duplicitously befriended the general to gain access to classified documents.