Frustra es.

http://lila-erc.eu/data/lexicalResources/LatinPortuguese/Velez/id/UsageExample/n1415.sg01.s99.u02 <http://www.w3.org/ns/lemon/lexicog#UsageExample>

Frustra es. 
Frustra es, 
erras; 

data from the linked data cloud