well-grounded

[wel-groun-did]
adjective
1.
based on good reasons; well-founded: His opposition to the scheme is well-grounded.
2.
well or thoroughly instructed in the basic principles of a subject: She is well-grounded in mathematics.

Origin:
1325–75; Middle English

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
well-grounded
 
adj
1.  well instructed in the basic elements of a subject
2.  another term for well-founded

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
She sounds so well-grounded and it's clear that your household is positively
  oozing with mutual respect and kindness.
The best shelter is a large, substantially constructed building with intact,
  well-grounded wiring and plumbing.
As a well-grounded claim for service connection for headaches has not been
  submitted, the appeal is denied as to that.
Board that the veteran has not submitted well-grounded claims for service
  connection for gouty arthritis of multiple.
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