Source : Webster's Revised Unabridged Dictionary (1913)

Lentitude \Len"ti*tude\ (l[e^]n"t[i^]*t[=u]d), n. [L. lentitudo,
   fr. lentus slow: cf. OF. lentitude. See {Lent}, a.]
   Slowness; sluggishness. [Obs.]