Very small.
Incalculably, exceedingly, or immeasurably minute; vanishingly small.
Of or pertaining to values that approach zero as a limit.
A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number).
Less than normal.
denormal
A person whose abilities are less than normal.
That part of the axis of a curved line which is intercepted between the ordinate and the normal.