IMPACTFUL
Etymology
Adjective
impactful (comparative more impactful, superlative most impactful)
Having impact. [from c. 1940]
Usage notes
• Proscribed by some authorities, who recommend influential or effective instead. Alternatively, one may rephrase to have an impact or have a strong impact. However, many usages can be found, particularly in business and education as well as in journalism and academic writing.
• Usage is more common in the US.
Synonyms
• effectual, impactive, consequential, significant, eventful
Antonyms
• impactless
Source: Wiktionary