I. AFFECTIONS IN GENERAL
[Nouns] affections, character, qualities, disposition, nature, spirit, tone; temper, temperament; diathesis, idiosyncrasy; cast of mind, cast of soul, habit of mind, habit of soul, frame of mind, frame of soul; predilection, turn, natural turn of mind; bent, bias, predisposition, proneness, proclivity, propensity, propenseness, propension, propendency; vein, humor, mood, grain, mettle; sympathy (love) [more].
soul, heart, breast, bosom, inner man; heart's core, heart's strings, heart's blood; heart of hearts, penetralia mentis; secret and inmost recesses of the heart, cockles of one's heart; inmost heart, inmost soul; backbone.
passion, pervading spirit; ruling passion, master passion; furore; fullness of the heart, heyday of the blood, flesh and blood, flow of soul.
energy, fervor, fire, force.
inborn, inbred, ingrained; deep-rooted, ineffaceable, inveterate; pathoscopic; congenital, dyed in the wool, implanted by nature, inherent, in the grain.
[Adverbs] in one's heart; at heart; heart and soul [more].