The term 'not apparent' can be described by several words, all of which have to do with something being hidden or not easily seen. The first word is 'COVERT, ' which means to be done in a secret or hidden way. The second word is 'OBSCURE, ' which means to be unclear or hard to understand. The third word is 'INVISIBLE, ' which means to be unable to be seen. The fourth word is 'IMPERCEPTIBLE, ' which means to be too small or subtle to be noticed. The fifth word is 'INCONSPICUOUS, ' which means to be not easily seen or noticed. All of these words describe something that is not apparent and are used to describe something that is hidden or not easily seen.