1. useless, futile

adjectival nouns or quasi-adjectives (keiyodoshi) noun (common) (futsuumeishi)

2. unnecessary, needless

adjectival nouns or quasi-adjectives (keiyodoshi) noun (common) (futsuumeishi)

3. not on business, unrelated, unauthorised, unauthorized

adjectival nouns or quasi-adjectives (keiyodoshi) noun (common) (futsuumeishi)

4. prohibited, banned, forbidden

adjectival nouns or quasi-adjectives (keiyodoshi) noun (common) (futsuumeishi)