Antonyms for the word 'are conspicuous' include 'are hidden', 'are inconspicuous', 'are obscure', and 'are unnoticeable'. When something is conspicuous, it is noticeable, prominent, or easily visible. The opposite of this is something that is hidden, concealed, or difficult to see. For instance, if a person is trying to hide from someone, they may choose to be inconspicuous. Similarly, when an object is obscure, it is not readily apparent or easily distinguishable. On the other hand, if something is unnoticeable, it goes unnoticed by people. These antonyms are useful in describing things that are not easily detectable or require more attention to notice.