surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• nuclear families
• nuclear family
• nuclear fission
• nuclear fissions
• nuclear-free zone
• nuclear-free zones
• nuclear fuel
• nuclear fuels
• nuclear fusion
• nuclearisation
• nuclearisations
• nuclearise
• nuclearised
• nuclearises
• nuclearising
• nuclearization
• nuclearizations
• nuclearize
• nuclearized
• nuclearizes
• nuclearizing
• nuclear magnetic resonance
• nuclear medicine
• nuclear physics
• nuclear poison