well-informed; erudite
Describes a person with broad knowledge, often used in formal or literary contexts. Can be used as a noun or adjectival noun.
He is known as a well-informed scholar.
A person of wide knowledge is versed in many fields.
widely read with a retentive memory
Composed of 博 (broad, extensive) and 聞 (hear, learn), literally 'widely heard'. The exact historical derivation is uncertain, but the kanji combination conventionally conveys erudition.