a horse-leech, whose deep maw The plethoric King Swellfoot could not fill, And who, till full, will cling for ever.
Source: wiktionary
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Keep "plethoric" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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5 total sentences available.
a horse-leech, whose deep maw The plethoric King Swellfoot could not fill, And who, till full, will cling for ever.
Source: wiktionary
If the predisposition to the disease has arisen from a plethoric state of the system, or from a turgescence in the vessels of the head, this is to be obviated by bleeding, both generally and topically, but more particularly the latter; an abstemious diet and proper exercise; and by a seton in the neck.
Source: wiktionary
Harold Atkinson, her host, was a fine handsome grey-haired man, plethoric and somewhat corpulent, with an eye for a pretty woman […].
Source: wiktionary
the judges [...] were arranging their robes and coughing into their fists, the ebb and flow of their plethoric wigs like a flock of sheep on the run.
Source: wiktionary
Showing 4 of 5 available sentences.
Closest matches include archaic usage, bloated, bursting, congested, crammed.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.