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The Collaborative International Dictionary
Desidious

Desidiose \De*sid"i*ose`\, Desidious \De*sid"i*ous\, a. [L. desidiosus, fr. desidia a sitting idle, fr. desid?re to sit idle; de- + sed?re to sit.] Idle; lazy. [Obs.]

Wiktionary
desidious

a. (context obsolete English) Lazy, idle, slothful.