leisure (adj.) Look up leisure at Dictionary.com
"free from business, idle, unoccupied," 1660s, from leisure (n.).
leisure (n.) Look up leisure at Dictionary.com
early 14c., leisir, "opportunity to do something," also "free time, time at one's disposal," from Old French leisir, loisir "capacity, ability, freedom (to do something); permission; spare time; free will; idleness, inactivity," noun use of infinitive leisir "be permitted," from Latin licere "to be allowed" (see licence (n.)).

Especially "opportunity afforded by freedom from necessary occupations" (late 14c.). "In Fr. the word has undergone much the same development of sense as in Eng." [OED]. The -u- appeared 16c., probably on analogy of pleasure (n.), etc. To do something at leisure "without haste, with deliberation" (mid-14c.) preserves the older sense. To do something at (one's) leisure "when one has time" is from late 15c.