adjective see: rapid Date: 15th century done, made, or acquired by stealth ; clandestine , acting or doing something clandestinely ; stealthy , see: secret ~ly adverb
SURREPTITIOUS
Meaning of SURREPTITIOUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012