Stagnant
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Literal Stillness
When used literally, 'stagnant' refers to water or air with no movement. It implies a lack of freshness. The swamp had a foul smell due to the stagnant water.
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Negative Connotation
'Stagnant' often has a negative connotation, suggesting problems or undesirability. We opened the windows to clear out the stagnant air.
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Metaphorical Use
Metaphorically, 'stagnant' describes situations or places lacking activity or change. After years of neglect, the old town felt stagnant.