1. (n.) The state or quality of being eager; ardent desire.

2. (n.) Tartness; sourness.

OK a thing for acceptance accord acquiescence affinity affirmation affirmative affirmative voice agreeability agreeableness agreement alacrity ambition amenability animation anxiety appetite approbation approval aptitude aptness ardor assent avidity aye bent bias blessing breathless impatience cast chafing cheerful consent compliance conatus concupiscence conduciveness connivance consent cooperativeness curiosity dash delight desideration desire diathesis disposition disquietude docility drive earnestness elan endorsement energy enthusiasm excitement fancy fantasy favorable disposition favorableness feeling for fervor forwardness fretfulness fretting gameness get-up-and-go go goodwill gusto haste hope horme hunger impatience impatientness impetuousness inclination intellectual curiosity keenness lather leaning liability libido liking longing lust for learning mind mustard need okay passion penchant permission pleasure pleasure principle pliability pliancy predilection predisposition prejudice probability proclivity promptitude promptness proneness propensity quickness ratification readiness receptive mood receptiveness receptivity relish responsiveness restiveness restlessness right mood sanction sensitivity to sexual desire soft spot spirit spiritedness stew submission susceptibility sweat tendency tense readiness thirst for knowledge tractability tropism turn twist uneasiness ungrudgingness unloathness unpatientness unquietness unreluctance urge vehemence verve vigor vim vitality want wanting warp weakness will will and pleasure willing ear willing heart willingness wish wish fulfillment wishing yearning zeal zealousness zest zing zip