(n.) The quality or state of being sentimental.

affection affectionateness amativeness amorousness bathos bleeding heart cloyingness corn corniness demonstrativeness ecstasy emotionalism enchantment goatishness goo gushiness hearts-and-flowers horniness lovelornness lovesickness maudlinness mawkishness mush mushiness namby-pamby namby-pambyism namby-pambyness nostalgia nostomania oversentimentalism oversentimentality pathos rapture romanticism sentiment sentimentalism sexiness slop sloppiness slush slushiness soap opera sob story soppiness stickiness susceptibility sweetness sweetness and light tackiness tearfulness tearjerker tenderness weepiness