34 synonyms for stagnant such as depressed, dead, dead, and declining. Stagnant is an adjective, and its antonyms are flowing, running, and fresh.
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.