How to Say "skeptical" in Spanish
The Spanish word for “skeptical” is “escéptico” — B2 level.

Examples
Soy muy escéptico con los productos que prometen resultados milagrosos.
I am very skeptical of products that promise miraculous results.
Ella se mostró escéptica ante la explicación del político.
She appeared skeptical regarding the politician's explanation.
Incluso los científicos más escépticos admitieron que el descubrimiento era real.
Even the most skeptical scientists admitted the discovery was real.
Matching Gender
Since this is an adjective, you must change the ending to 'escéptica' if you are describing a woman or a feminine object.
Small Connecting Words
When you are skeptical 'about' something, Spanish usually uses the words 'con' or 'ante' (regarding/in the face of).
Using the wrong 'To Be'
Mistake: “Estoy escéptico.”
Correction: Soy escéptico.
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