surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

surreptiˈtiously adverb

• questioningly
• questionings
• questionist
• questionists
• questionless
• question mark
• question marks
• question master
• question masters
• questionnaire
• questionnaires
• question of fact
• question of law
• question of privilege
• questions
• question tag
• question tags
• question time
• question times
• questor
• questrist
• quests
• quetch
• quethe
• quetsch