having a foundation in fact; based on good reasons, information, etc.: well-founded suspicions.

1325–75; Middle English

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having good grounds: well-founded rumours

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Example sentences
Idle rumors were also added to well-founded apprehensions.
But the discrepancy is a reminder that family stories-even well-founded
  ones-are closer to mythology than to history.
The legal standard is the same standard used to establish a well-founded fear
  of persecution in an asylum case.
She contends that she demonstrated past persecution and showed that she had a
  well-founded fear of future persecution.
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