without value, effect, consequence, or significance.

being or amounting to nothing; nil; lacking; nonexistent.

Mathematics . (of a set)

empty.

of measure zero.

being or amounting to zero.

Electronics . a point of minimum signal reception, as on a radio direction finder or other electronic meter.

to cancel; make null. ?

null and void

without legal force or effect; not valid

This contract is null and void.

adjective

effective , effectual , valid , valuable , worthwhile , worthy

adjective

absent , bad , barren , characterless , imaginary , ineffective , inefficacious , inoperative , invalid , negative , nonexistent , nothing , null and void * , powerless , unavailing , unreal , unsanctioned , useless , vain , void , worthless , ineffectual , insignificant , nugatory , nullify , zero

noun

nil