To remember; to be mindful of or pay attention to.

Focused alertness, quick-thinking resourcefulness, stability of thought and feeling, or good sense, especially in spite of circumstances which are distracting, stressful, or otherwise challenging.

(transitive, idiomatic) To consider, to contemplate, to intend.

Hallucinogenic. / Having an overwhelming effect on the imagination; mind-boggling.

(philosophy) Describing the physical action of the mind on the body, especially the mode in which a thought can cause an action

Hallucinogenic. / Mentally taxing.

To discern (or appear to discern) someone's thoughts

(idiomatic) Excessively boring, tedious, or dull; repetitive; of an activity, etc., lacking any interest or variety that might serve as intellectual stimulation.

Something very puzzling, confusing or surprising.

Alternative spelling of mind-boggler