stagnant

adj

Etymology: From French stagnant, from Latin stagnans, present participle of stagno (“to form a pool of standing water”).

1. Lacking flow or motion, and thus usually not fresh or healthy; decaying through stillness.

   “a stagnant pool    stagnant water”

2. Without activity, change or progress, or excitement in an unhealthy manner; inactive, stale.

   “a stagnant economy    stagnant prices”

   “Their love had turned stagnant.”