Green’s Dictionary of Slang

enif n.

fine.

1859		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.
1882		Sydney Sl. Dict. (2 edn) 11: Enif - Fine.
1887		J.W. Horsley Jottings from Jail 4: Hi, yob! kool that enif elrig with the nael ekom.