stagnate

verb

1. (intransitive)To cease motion, activity, or progress:

   “If the water stagnates, algae will grow.”

2. (intransitive)To cease motion, activity, or progress:

   “Air stagnates in a closed room.”

3. (intransitive)To cease motion, activity, or progress:

   “Ready-witted tenderness […] never stagnates in vain lamentations while there is any room for hope.”

   “Listening to what others say, especially to what they teach, prevents our minds stagnating, thus promoting mental growth into old age.”

4. (transitive, usually)To stop the flowing or running of

   “These poor people cannot go to mountains in the later summer and the early autumn to escape the miasm, and no legislative body has any moral right by undertaking improvements, to stagnate the river marshes.”

5. (transitive)To stop the development, advancement, or change of; to make idle.

   “The myths and values of history have determined our consciousness, have destroyed our wholeness, Mind, experienced as separate from and superior to the body has all but closed our senses and ultimately stagnated the mind.”

adj

1. Stagnant.