surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• pennilessnesses
• pennill
• pennine
• pennines
• penning
• penninite
• Pennisetum
• pennon
• pennoncel
• pennoncelle
• pennoncelles
• pennoncels
• pennoned
• pennons
• penn'orth
• Pennsylvania Dutch
• penny
• penny-a-line
• penny-a-liner
• penny-a-linerism
• penny ante
• penny-ante
• penny antes
• penny arcade
• penny arcades