Learn how to say Stagnancy correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word stagnant:
(of a body of water or the atmosphere of a confined space) having no current or flow and often having an unpleasant smell as a consequence:
a stagnant ditch
showing no activity; dull and sluggish:
a stagnant economy
mid 17th century: from Latin stagnant- ‘forming a pool of standing water’, from the verb stagnare, from stagnum ‘pool’