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The Collaborative International Dictionary
Infestive

Infestive \In*fest"ive\, a. [L. infestivus. See In- not, and Festive.] Having no mirth; not festive or merry; dull; cheerless; gloomy; forlorn. [R.]

Wiktionary
infestive

a. Tending to infest; acting like an infection.