Having a significant or powerful effect.
Usage Note: The word impactful rankles many people. Even though the -ful suffix was historically productive, yielding helpful words like eventful, bountiful, wonderful, and helpful itself, many view impactful as an affront to the English language, perhaps because of its association with the jargon of advertising and business. In our 2015 survey, 77 percent of the Usage Panel found the sentence This software will allow you to create impactful and original imagery to be unacceptable. Using this word in your speech and writing will be undoubtedly have a great impact, but probably not in the way you'd like.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.
American Heritage Dictionary Products
The American Heritage Dictionary, 5th Edition
The American Heritage Dictionary of Idioms
The American Heritage Roget's Thesaurus
Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
The American Heritage Essential Student Thesaurus