noun
a quantity or value that is extremely small or close to zero
adjective
exceedingly small; minute
-
The scientist explained that the difference in size was infinitesimal, almost impossible to detect.
-
I could barely see the infinitesimal bug crawling on the leaf.
-
The chances of winning the lottery are infinitesimal, don't get your hopes up.
-
Her patience was wearing thin, reduced to an infinitesimal amount after waiting for hours.