Gloomily morose; ill-natured, abrupt, and rude; severe; sour; crabbed; rough; sullen; gloomy; as, a surly groom; a surly dog; surly language; a surly look
Someone who is surly behaves in a rude bad-tempered way. He became surly and rude towards me. bad-tempered and unfriendly = sullen (sirly (14-17 centuries), from sir)