Dictionary:

knowledgeable

  (nŏl'ĭ-jə-bəl)

Possessing or showing knowledge or intelligence; perceptive and well-informed.

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adjective

1. Provided with information; made aware: acquainted, advised, educated, enlightened, informed, instructed. See knowledge/ignorance.
2. Having or showing intelligence, often of a high order: brilliant, intellectual, intelligent, knowing. Informal brainy. See ability/inability.

Definition: aware, educated
Antonyms: ignorant, ill-informed, unaware, uneducated, uninformed

The adjective has 4 meanings:

Meaning #1: highly educated; having extensive information or understanding
  Synonyms: enlightened, knowing, learned, lettered, well-educated, well-read

Meaning #2: thoroughly acquainted with and skilled in something through study or experience
  Synonym: versed

Meaning #3: alert and fully informed
  Synonyms: aware, knowing

Meaning #4: thoroughly acquainted with through study or experience
  Synonyms: intimate, intimate with, knowledgeable about

Common misspelling(s) of knowledgeable

• knowlegeable