brackish, motionless, quiet, sluggish, stale, standing, still
active, clear, flowing, fresh, lively, moving, pure, running, thriving, unpolluted
English Collins Dictionary - English synonyms & Thesaurus
1 adj If something such as a business or society is stagnant, there is little activity or change., (disapproval)
He is seeking advice on how to revive the stagnant economy..., Mass movements are often a factor in the awakening and renovation of stagnant societies.
2 adj Stagnant water is not flowing, and therefore often smells unpleasant and is dirty.
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