Stinky

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Old English stincan, of West Germanic origin; related to Dutch and German stinken, also to stench.

wiktionary

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From Middle English stinky, stynky, equivalent to stink +‎ -y. Compare Dutch stinkig(“stinky, foul, rotten”), German stinkig(“stinky”), Hunsrik stinkich.

etymonline

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stinky (adj.)

1888, from stink (n.) + -y (2). Related: Stinkiness. Stinko "of very poor quality" is from 1924.