Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* prae-mŏlestĭa, ae, f., trouble beforehand, anxiety, apprehension; another term for metus: alii metum praemolestiam appellabant, quod est quasi dux consequentis molestiae, Cic. Tusc. 4, 30, 64.