While the word fervid is known to every literate speaker of English, its prefixed congener perfervid is not part of many speakers’ vocabulary––but should be withal. The intensity of meaning added by the prefix per- results in the definition ‘very fervid; ardent, impassioned’ (Oxford English Dictionary Online), annotated as follows:
Origin: A borrowing from Latin. Etymon: Latin perfervidus.
Etymology: < post-classical Latin perfervidus (chiefly in the phrase perfervidum ingenium Scotorum the impassioned genius of the Scots, founded on G. Buchanan’s Scotorum praefervida ingenia ( Rerum Scoticarum Historia (1582) xvi. li.)) < classical Latin per- per- prefix + fervidus fervid adj. Compare earlier praefervid adj.
The prefix per– is glossed by the OED in the following manner:
- Forming words with the sense ‘thoroughly, perfectly, extremely, very’: with adjectives and adverbs, as classical Latin peracūtus very sharp, peracute adj., perdīligēns very diligent, perdiligent adj., post-classical Latin perfervidus, perfervid adj., etc. Formerly also in English with derived nouns (or their analogues), in sense ‘very great’, ‘extreme’: see e.g. perdiligence n., peradvertence n.
Notionally, the utility of this word can be reckoned to be heightened by the digital revolution and a popular culture that regards anything lacking perfervidity in its espousal (alas!) as less than authentic.