Not effective.
Not able to assume active duty.
A member of the military who is unable to assume active duty.
Insignificant.
Having no validity; "null and void".
Causing a complete loss of gene function; amorphic.
Absent or non-existent.
Of the null set.
Of or comprising a value of precisely zero.
Neutral.
The null character; the ASCII or Unicode character (␀), represented by a zero value, which indicates no character and is sometimes used as a string terminator.
Zero quantity of expressions; nothing.
One of the beads in nulled work.
A non-existent or empty value or set of values.
Something that has no force or meaning.
The attribute of an entity that has no valid value.
The null hypothesis.
To crack; to remove restrictions or limitations in (software).
To return to the null position, setting, etc.
To form nulls, or into nulls, as in a lathe.