judas-haired, adj. — Green’s Dictionary of Slang

judas-haired adj.

[the biblical Judas was supposedly red-haired]

1. red-haired.

1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.

2. deceitful.

1829		London Standard 29 Apr. 2/5: Then rose by his elbow a Judas-haired slave, / A soft-spoken scoundrel as e’er played the knave.
1864, 1867, 1870, 1871		see sense 1.