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, related words, and verbs for stagnant.
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.