1. (used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition

- rancid butter

- rancid bacon

Similar word(s): stale

2. smelling of fermentation or staleness

Similar word(s): malodorous, malodourous, stinky, sour

Sentences with rancid as an adjective:

- The house was deserted, with a rancid half-eaten meal still on the dinner table.

- His remarks were rancid; everyone got up and left.