surreptitious

adj.

鬼鬼祟祟的；私下的，秘密的；

1. She carried out a surreptitious search of his belongings.
   她暗地里搜查他的东西。
2. His surreptitious behaviour naturally aroused suspicion.
   他那鬼鬼祟祟的行为自然引起了旁人的怀疑。
3. He was surreptitious in his movements.
   他行踪诡秘。

Surreptitious use of medication by placebo subjects.
Surreptitious diuretic ingestion and pseudo-Bartter's syndrome.
Surreptitious Software: Obfuscation, Watermarking, and Tamperproofing for Software Protection
Stealth Marketing: How to Reach Consumers Surreptitiously
Hyperelongated biglycan: the surreptitious initiator of atherosclerosis.
Electromagnetic shield to prevent surreptitious access to contactless smartcards
Pseudo-Bartter's syndrome from surreptitious diuretic intake: differential diagnosis with true Bartter's syndrome
Factitious hypoglycemia due to surreptitious administration of insulin. Diagnosis, treatment, and long-term follow-up
Information-bearing article for conveying information which cannot be surreptitiously detected
Deamidation and isoaspartate formation in proteins: unwanted alterations or surreptitious signals?