The quality or state of being droopy, wilted, lethargic, or lacking energy.
From 'flaggy' (Old Norse flag, to droop or flap) plus the nominal suffix '-ness', creating an abstract noun describing the quality or condition.
The suffix '-ness' is one of English's most productive ways to turn adjectives into nouns—'flagginess' captures the very essence of that drooping, tired feeling in a single word.
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