Adjective
/ˈneglijəbəl/,
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So small or unimportant as to be not worth considering; insignificant,

So small or unimportant as to be not worth considering; insignificant
 
sound could at last be recorded with incredible ease and at negligible cost
Web Definitions:
 so small as to be meaningless; insignificant; "the effect was negligible"
 not worth considering; "he considered the prize too paltry for the lives it must cost"; "piffling efforts"; "a trifling matter"
 Negligible refers to the quantities so small that they can be ignored (neglected) when studying the larger effect. ...
 In mathematics, a negligible function is a function such that for every positive integer c there exists an integer N'c such that for all x > N'c,
 Able to be ignored or excluded from consideration; too small or unimportant to be of concern
 (negligibly) To a degree that is negligible; so small or slight that it may be ignored
 of very little value, almost worthless
 able to be neglected or discarded.