Of a person, the mind, etc.: educated in all or many subjects; having an extensive knowledge, experience, or range of interests; widely accomplished.

Having infinite or extensive knowledge; omniscient.

= omniscient, adj.

Of or relating to the pancratium. More generally: fully disciplined or exercised in mind; having every kind of skill or accomplishment.

That knows, or gives the impression of knowing, everything. Also: characteristic of a know-all.

hyperbolically. Having extensive knowledge, or as much knowledge as possible in a certain field or area; very learned or knowledgeable; knowing.

Of or relating to extensive or varied learning; = polymath, adj.

learned in all, or very many subjects.

of or relating to a polyhistor; widely erudite.

Of or relating to a polymath; characterized by extensive or varied learning.

= know-all, adj.

attributive. Knowing, or appearing to know, all about something; = know-all, adj.

(a) Stupid, idiotic. (b) That is a pointy-head; having pretensions to superior expertise but without practical sense. (c) Technically or…

Of, relating to, or characteristic of a ‘pointy-head’; intellectual, rarefied, abstruse.