Definition of plethorically in English:
plethorically
Pronunciation /plɛˈθɒrɪkli/ /plɪˈθɒrɪkli/
adverb
In a plethoric manner; to an excessive degree.
Origin
Early 19th century; earliest use found in Charles Lamb (1775–1834), essayist. From plethoric + -ally.