Given to playing the master; imperious or domineering.
Fit to command.
Revealing mastery or skill; expert: a masterful technique; masterful moviemaking.
derivatives
maśter·ful·ly
adverb
maśter·ful·ness
noun
usage note
Usage Note: According to a widely repeated dictum, masterful should be reserved for the sense “imperious, domineering” (as in a masterful tone of voice ), whereas masterly should be the choice when the intended sense is “having the skill of a master” (as in a masterly performance of the sonata ). The distinction can serve a useful purpose, but masterful in the latter sense has long been common in reputable writing and cannot be regarded as incorrect.
The American Heritage® Dictionary of the English Language, Fourth Edition