covertly
adverb/ˈkʌvətli/, /ˈkəʊvɜːtli/
/ˈkəʊvɜːrtli/
(formal)- in a way that is secret or hidden, making it difficult to notice synonym secretly
- She watched him covertly in the mirror.
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covertly
Definition of covertly adverb from the Oxford Advanced Learner's Dictionary