Adjective (い)
Usually written in kana
1. nonexistent; not being (there)
通路を抜けたその部屋の入り口には扉はなかった。There was no door at the entrance to the room beyond the corridor.
2. unowned; not had; unpossessed
実力も才能もないくせに。And you don't even have any skill or talent.
3. unique
4. not; impossible; won't happen
as ...ことがない, etc.; indicates negation, inexperience, unnecessariness or impossibility
何も心配することなんかない。There is nothing to worry about.
Adjective (い)
Aux. adjective
5. not
after the conjunctive form of an adjective
6. to not be; to have not
after the -te form of a verb