well-ground·ed

[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. 2013.
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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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Well-grounded is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
Example sentences
Viewpoints should be well-grounded in scientific fact and well-researched.
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 evidence of a well-grounded claim for
  service connection for degenerative joint disease.
The best shelter is a large, substantially constructed building with intact,
  well-grounded wiring and plumbing.
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