" plenteously "

[Adjective]  | "plen*te*ous" | \ ˈplen-tē-əs \

1: fruitful, productive —usually used with in or of

2: constituting or existing in plenty

Origin: 14th century ;

 Middle English plenteus, plenteous, plenteouse, borrowed from Anglo-French plenteos, plentuous "rich, fertile, abounding, plentiful," probably from plenté "abundance, {see: |plenty:2|plenty:2}" + -os, -ous {see: |-ous|-ous};

  * Note : These Middle English and Anglo-French forms are far outnumbered by variants with medial -v-/-f-/-u-: plentevous, plenteuous, plentiuous, plentifus, etc., for English, and plentivous, plentevous, etc., for French. These have been taken as suffixation with -ous of Anglo-French plentif "abundant, plentiful," apparently formed from plenté and -if {-ive|-ive}. It is uncertain if plenteus, etc., is formed as shown in the above etymology, or from vocalization and deletion of /v/, perhaps after shift of the stress to the initial syllable; the use of <u> and <v> as interchangeable graphic variants for /v/ or /w/ or /u/ allow for a variety of readings. A full display of these and other variants can be found in Middle English Dictionary and Oxford English Dictionary, third edition.;

[Adverb]  | "plenteously" 

[Adjective]  | "plenteous"