Green’s Dictionary of Slang

1. silly.

1909

Farmer & Henley Sl. and Its Analogues (rev. edn).

2. bad, e.g. abaa cove, a bad man.

1889–90		Barrère & Leland Dict. of Sl., Jargon and Cant.
1909		Farmer & Henley Sl. and Its Analogues (rev. edn).