surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• isopropyl
• isopropyls
• Isoptera
• isopteran
• isopterans
• isopterous
• isopycnic
• isopycnics
• isorhythmic
• isos
• isosceles
• isoseismal
• isoseismals
• isoseismic
• isosmotic
• isospin
• isospins
• isospories
• isosporous
• isospory
• isostasies
• isostasy
• isostatic
• isostatically
• isostemonous