imperceptible
/ˌɪmpəˈsɛptɪbəl/adjective
Too slight or small to be noticed or sensed.
Example sentence
- “The change in temperature was so gradual it was imperceptible.”
Often softened with 'almost' or 'nearly': 'an almost imperceptible nod'.
Related words
imperturbableStaying calm no matter what happens; impossible to fluster.imperativeAbsolutely necessary; of the greatest importance.impetuousActing suddenly on impulse and with force, without thinking things through.impedeTo slow something down or make it harder for it to move forward.implementAn object or tool used to carry out a particular kind of work.impeccableSo good that no fault can be found; flawless.