stagnant

As adjectives the difference between impending and stagnant

is that impending is approaching; drawing near; about to happen while stagnant is lacking freshness, motion, flow, progress, or change; stale; motionless; still.

As a verb impending

is present participle of lang=en.

As an adjective stagnant

is lacking freshness, motion, flow, progress, or change; stale; motionless; still.

As a noun ditchwater is

the stagnant water that collects in a ditch.

As adjectives the difference between stagnant and euxinic

is that stagnant is lacking freshness, motion, flow, progress, or change; stale; motionless; still while euxinic is having restricted hydrologic circulation, leading to stagnant or anaerobic conditions.