How to Say "well-founded" in Spanish
The Spanish word for “well-founded” is “sentado” — B2 level.
English → SpanishB2
AdjectiveB2formal
referring to arguments or theories

Examples
Nuestra política se basa en principios bien sentados.
Our policy is based on well-established principles.
Era una decisión sentada y muy lógica.
It was a sound and very logical decision.
Figurative Usage
When used figuratively, 'sentado' means the idea or concept is 'solid' or 'well-rooted,' just like a person firmly seated and stable.
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