Green’s Dictionary of Slang

uncomeatable adj.

[OED has as SE, but does not offer the sexual sense; Johnson described it as a ‘low, corrupt word’]

[of a girl or woman] resistant to seduction.

J. Phillips [trans.] Cervantes Don Quixote 222: [W]hen I bethought my self how uncomatable young Virgins were i’ that place, Despair so seiz’d upon my Spirits.