Imperceptible (en. Imperceptible)
/im.peɾ.θep.'ti.βle/
Slang Meanings
Something that is not noticeable at first glance.
That detail is so imperceptible that I don't think anyone will catch it.
Ese detalle es tan imperceptible que no creo que nadie lo capte.
A small change that cannot be easily detected.
His reaction was so imperceptible that I didn't notice it.
Su reacción fue tan imperceptible que no me di cuenta.