surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• stone-breaker
• stone-breakers
• stonebreaks
• stone-broke
• stone canal
• stone canals
• stonecast
• stonecasts
• stone cell
• stone cells
• stonechat
• stonechats
• stone circle
• stone circles
• stone coal
• stone coals
• stone-cold
• stone-cold sober
• stone-colour
• stone-coloured
• stone-colours
• stone crab
• stone crabs
• stone-crazy
• stonecrop