1. In a surreptitious manner
   "he was watching her surreptitiously as she waited in the hotel lobby"
   - sneakily, clandestinely

See also: surreptitious

• extrospective
• extroversion
• extroversive
• extrovert
• extroverted
• extrovertish
• extrovertive
• extrude
• extrusion
• extrusive
• exuberance
• exuberant
• exuberantly
• exuberate
• exudate
• exudation
• exude
• exult
• exultant
• exultantly
• exultation
• exulting
• exultingly
• exurb
• exurban