Expressed or performed with emphasis: responded with an emphatic "no.” (adjective)
Forceful and definite in expression or action.(adjective)
Standing out in a striking and clearly defined way.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "emphatic" in a sentence
"Only slighly less annoying—and a by product of using emphasis too often—is what I call the emphatic emphasis: emphasizing a sentence or phrase with, for example, italics, and then emphasizing again a word within the phrase with bold, underlining, or caps."
"Young finally ended the competition in emphatic fashion."
"The Celtics bounced back from back-to-back losses in emphatic fashion, beating the Sacramento Kings 108-63 Sunday night in one of the most one-sided wins in franchise history."