Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
suc-crotillus (subc-), a, um, adj., thin, slender, delicate (ante-class.): succrotilla vox tenuis et alta. Titinnius: femina fabulare succrotillā voculā. Afranius in epistulā: loquebatur succrotillā voce serio. Plautus in describendis mulierum cruribus gracilibus in Syro: cum extortis talis, cum succrotillis crusculis, Fest. p. 301 Müll.