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

See also: surreptitious

• genus Matricaria
• genus Matteuccia
• genus Matthiola
• genus Maxillaria
• genus Maxostoma
• genus Mayaca
• genus Mayetiola
• genus Mazama
• genus Meconopsis
• genus Medicago
• genus Medinilla
• genus Megachile
• genus Megaderma
• genus Megalobatrachus
• genus Megalosaurus
• genus Megaptera
• genus Megatherium
• genus Melampodium
• genus Melampsora
• genus Melanerpes
• genus Melanitta
• wild cherry tree
• wild chervil
• wild China tree
• wild cinnamon