stagnant
[adjective]
Synonyms: stale, quiet, sluggish, still

[TahlilGaran] English Synonym Dictionary ▲

stag‧nant /ˈstæɡnənt/ adjective

1. stagnant water or air does not move or flow and often smells bad:
a stagnant pond

2. not changing or making progress, and continuing to be in a bad condition:
a government plan to revive the stagnant economy

[TahlilGaran] Dictionary of Contemporary English ▲