half-drunk russian

• полупья́ный

  tipsy, half drunk, half-seas-over

• недопитый

  unfinished (drink), half-drunk, partially drunk

Examples

• Я уже полбутылки вина вы́пил, пока тебя ждал.I've already drunk half a bottle of wine while I was waiting for you.
• Я уже полбутылки вина вы́пил, пока вас ждал.I've already drunk half a bottle of wine while I was waiting for you.