all there Idiom
not all there
retarded, slow to learn, one brick short... Sometimes Vincent acts kind of strange - like he's not all there.
all there|all|all here|here|there
adj. phr.,
informal Understanding well; thinking clearly; not crazy.

Usually used in negative sentences,
Joe acted queerly and talked wildly, so we thought he was not all there.
all there
all there Having one's wits about one, mentally competent, as in
John may seem absentminded, but believe me, he's all there. This phrase is often used negatively, as
not all there, for being without one's full faculties. For example,
I wonder about Justin; sometimes it seems as if he's not all there. [Mid-1800s]
all there
Having all of one's wits, intelligence, or brainy adequacy intact, usually acclimated in the abrogating to catechism whether or not that is absolutely the case. He says he knows area we're going, but I'm not abiding he's absolutely all there. My mom brand to act like she's not all there sometimes, but she's absolutely abundantly witty.Learn more: all, thereall there
Fig. alert, aware, and mentally sound. (Usually negative.) After talking with Larry today, I get the activity that he's not absolutely all there. You do such absurd things sometimes! I admiration if you're all there.Learn more: all, thereall there
Having one's experience about one, mentally competent, as in John may assume absentminded, but accept me, he's all there. This byword is generally acclimated negatively, as not all there, for actuality after one's abounding faculties. For example, I admiration about Justin; sometimes it seems as if he's not all there. [Mid-1800s] Learn more: all, thereˌall ˈthere
(informal) accepting a advantageous mind; cerebration clearly: He behaves actual abnormally at times — I don’t anticipate he’s absolutely all there.Learn more: all, there all there
Mentally hale or competent.Learn more: all, there