Occult often implies mysterious knowledge or activities that mainstream culture may view with suspicion or intrigue. The ancient book contained many occult symbols that puzzled the archaeologists.
Pro Tip 2/3
Not Always Negative
While 'occult' can have a dark connotation, it is not inherently negative and can just refer to hidden matters. The herbalist's remedies had an occult significance known only to her.
Pro Tip 3/3
Not Scientific
Occult is rarely used in scientific contexts and more often in literary or esoteric ones. The detective novel explored an occult phenomenon that defied logical explanation.