Definition of Judas-coloured in English:

Judas-coloured

adjective

(US Judas-colored)
  • (Especially of hair) of a red or yellowish-red colour; having hair or a beard of this colour.

    Now chiefly in historical contexts.

Origin

Late 17th century; earliest use found in John Dryden (1631–1700), poet, playwright, and critic. From the medieval popular tradition that Judas Iscariot had red hair.