well grounded

/ˌwɛlˈɡraʊndɪd/
adjective
  1. Based on good reasons or evidence; justified.
    • Her fear of flying was well-grounded after she read about the mechanical issues.
    • His optimism about the project was well-grounded, given the team's strong track record.
    • The scientist's theory is well-grounded in years of experimental data.
  2. Having a solid foundation in a subject; thoroughly trained or educated.
    • She is well-grounded in mathematics and can solve complex problems easily.
    • The new employee is well-grounded in customer service from her previous job.
    • A well-grounded education in history helps people understand current events.
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