co·vert 
/ˈkoʊvɚt/ adjective
/ˈkoʊvɚt/ adjective [more covert; most covert] : made, shown, or done in a way that is not easily seen or noticed : secret or hidden
▪ a covert glance/look ▪ He has taken part in a number of covert military operations. ▪ spy agencies taking covert action — opposite overt
▪ a covert glance/look ▪ He has taken part in a number of covert military operations. ▪ spy agencies taking covert action — opposite overt
— cov·ert·ly adverb
— cov·ert·ness noun [noncount]
