Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
3. dextĕre and dextrē, adv., dexterously, skilfully: dextre obeundo officia, Liv. 1, 34 fin. Comp.: nemo dexterius fortunā est usus, Hor. S. 1, 9, 45.