1. A base or dishonorable person; a knave or scoundrel.
Usage: archaic; chiefly British
2. A man of low social status; a menial or servant.
Usage: archaic; historical

Examples

• The coistrel was thrown out of the tavern for his disreputable behavior.
• He was nothing but a coistrel, unworthy of the lady's attention.
• The knight dismissed the coistrel with contempt.
• That coistrel would steal from anyone if given the chance.
• She refused to associate with such a coistrel.