surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• tent stitch
• tent stitches
• tentwise
• tent-work
• tent-works
• tenty
• tenue
• tenues
• tenuious
• tenuirostral
• tenuis
• tenuities
• tenuity
• tenuous
• tenuously
• tenuousness
• tenuousnesses
• tenurable
• tenure
• tenured
• tenures
• tenure track
• tenure tracks
• tenurial
• tenurially