How to Say "well-adjusted" in Spanish
The Spanish word for “well-adjusted” is “equilibrado” — B1 level. This is a very common word in everyday Spanish.

Examples
Para estar sano, es necesario seguir una dieta equilibrada.
To be healthy, it is necessary to follow a balanced diet.
Es un hombre muy equilibrado que nunca pierde la calma.
He is a very well-adjusted man who never loses his cool.
El presupuesto de la empresa está finalmente equilibrado.
The company budget is finally balanced.
Gender Matching
Since this is an adjective ending in -o, you must change it to 'equilibrada' if the thing you are describing is feminine, like 'una comida equilibrada' (a balanced meal).
Ser vs. Estar
Use 'ser' when describing a person's permanent character (He is a balanced person) and 'estar' when describing the current state of something (The budget is balanced now).
Overusing 'Balanceado'
Mistake: “Mi dieta es balanceada.”
Correction: Mi dieta es equilibrada. While 'balanceado' is used in Latin America, 'equilibrado' is the more standard and widely accepted word for a healthy diet in Spanish.
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