Translation of "Imperceptible" in English

El sonido era prácticamente imperceptible.

- The sound was nearly indetectable.
- The sound was practically imperceptible.
- The sound was almost unnoticeable.

Urano, por ejemplo, es casi imperceptible a simple vista.

Uranus, for example, can be barely seen with the naked eye.

Neptuno, en cambio, es totalmente imperceptible a simple vista.

Neptune is totally invisible to your eye.

Entre la belleza y la fealdad a menudo no hay más que un punto casi imperceptible.

There is often only one point between beauty and ugliness, and it is almost imperceptible.