How to Say "imperceptible" in Spanish
The Spanish word for “imperceptible” is “insensible” — C1 level.
English → SpanishC1
adjectiveC1formal
too small or gradual to be noticed

Examples
Hubo un cambio insensible en la temperatura del agua.
There was an imperceptible change in the water temperature.
La mejoría del paciente fue lenta e insensible al principio.
The patient's improvement was slow and imperceptible at first.
Placement Matters
In this formal sense, 'insensible' almost always comes after the noun it describes (e.g., 'cambio insensible').
Related Translations
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