non-obvious

adjective

1. easily seen, recognized, or understood; open to view or knowledge; evident: an obvious advantage.
2. lacking in subtlety.
3. Obsolete. being or standing in the way.

adjective

1. easy to see or understand; evident
2. exhibiting motives, feelings, intentions, etc, clearly or without subtlety
3. naive or unsubtlethe play was rather obvious
4. obsolete being or standing in the way

adj.1580s, “frequently met with,” from Latin obvius “that is in the way, presenting itself readily, open, exposed, commonplace,” from obviam (adv.) “in the way,” from ob “against” (see ob-) + viam, accusative of via “way” (see via). Meaning “plain to see, evident” is first recorded 1630s. Related: Obviously; obviousness.