(n.) A ludicrous descent from the elevated to the low, in writing or speech; anticlimax.

anticlimax bleeding heart cloyingness comedown goo hearts-and-flowers heaviness heaviness of heart heavy heart heavyheartedness maudlinness mawkishness mush mushiness namby-pamby namby-pambyism namby-pambyness nostalgia nostomania oversentimentalism oversentimentality pathos romanticism sadheartedness sadness sentiment sentimentalism sentimentality slop sloppiness slush soap opera sob story sweetness and light tearjerker