"All there mentally" is a phrase that refers to someone who is fully present and capable of clear thinking. Some possible synonyms for this phrase include "mentally sharp," "clear-headed," "alert," "vigilant," and "awake." Other phrases that convey a similar meaning might include "mentally sound," "in good mental health," or "mentally agile." These terms are often used to describe someone who is attentive, focused, and able to make quick decisions based on information presented to them. Whether in business, sports, or academic settings, being "all there mentally" can be a significant advantage, allowing individuals to quickly assess situations and respond with clarity.