Which adjective describes something that is not openly acknowledged or displayed?

The term 'covert' is used to describe something that is not openly acknowledged or displayed, which aligns perfectly with the concept of secrecy or hidden actions. It conveys the idea that certain activities or intentions are concealed and not visible to the public eye. This is often relevant in various contexts, such as intelligence operations or undercover work, where the goal is to keep certain information undisclosed.

Options like 'obvious,' 'transparent,' and 'manifest' suggest clarity and openness, which are contrary to the meaning of 'covert.' 'Obvious' implies something that is clearly visible or easy to understand, while 'transparent' denotes openness and lack of hidden agendas. 'Manifest' also refers to something that is clear and evident. Thus, 'covert' stands out as the correct choice because it specifically captures the essence of concealment, which is essential in understanding the nuance of the question.