surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• gluey
• glueyness
• glueynesses
• glufosinate
• glug
• gluggable
• glugged
• glugging
• glugs
• gluier
• gluiest
• gluing
• gluish
• glum
• glumaceous
• glume
• glumella
• glumellas
• glumes
• glumiferous
• Glumiflorae
• glumly
• glummer
• glummest
• glumness