expert

adjective
1

Extraordinary capable or knowledgeable.

"I am expert at making a simple situation complex."

2

Characteristic of an expert.

"This problem requires expert knowledge."

3

Proven, experienced, veteran.

noun
1

A person with extensive knowledge or ability in a given subject.

"If an expert says it can't be done, get another expert. - David Ben-Gurion"

2

A player ranking just below master.

verb
1

To have (something) reviewed or checked by an expert.

Source: https://en.wiktionary.org/wiki/expert

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