NSW Selective & Scholarship
Imperceptible
adjective/im-per-SEP-ti-bul/
So small or slight that it can hardly be noticed.
In contextWith an imperceptible nod, she signalled the team to start the play.
Remember it
Imperceptible is 'im' (not) plus 'perceive': too tiny for you to perceive.
Use it well
Use 'imperceptible' for changes too small to sense, stronger than 'small'.