See languish in Webster's New World Roget's A-Z Thesaurus II
verb
To lose strength or power:
decline, degenerate, deteriorate, fade, fail, flag2, sink, wane, waste (away), weaken. (Informal) fizzle (out). Idioms: go downhill, hit the skids. See increase, strongTo waste away from longing or grief:
pine (away), wither. See health
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