Stagnant synonyms such as depressed, dead, dead, and declining. Stagnant is an adjective, and its antonyms are flowing, running, and fresh. Additionally, here are 34 synonyms for stagnant and words similar to it.
Brackis, dead, dirty, filthy, foul, immobile, inert, lifeless, motionless, putrefied, putrid, slack, stale, standing, static, stationary, and still.
Dead, declining, depressed, dormant, dull, dying, flat, inactive, lethargic, moribund, quiet, slow, slow-moving, sluggish, stagnating, and static.