High-impact

adj.capable, hopefulprofessional

What it means

Producing a large, important, or readily observable effect.

Reach for it when praising consequential work while leaving its mechanism and evidence visible

The clinic chose one high-impact change: evening appointments twice a week.

playful
game-changing
informal excitement suits a change to the rules or possibilities
not when The phrase is hype when the improvement does not alter the underlying situation.
everyday
effective
the action achieves its intended result
not when Effective can describe a modest result and says nothing about scale.
everyday
powerful
felt force matters more than measured reach
not when Powerful can describe an emotional impression with no lasting result.
warm
transformative
the change reshapes a person's or system's possibilities
not when Transformative claims a deeper reshaping than a large but bounded impact.
professional
influential
the work changes decisions, thinking, or behavior
not when Influence may be indirect and cannot guarantee a beneficial impact.
formal
consequential
the outcome materially alters what follows
not when Consequential is neutral about whether the effect is welcome.
literary
far-reaching
effects spread across many people or future decisions
not when Far-reaching concerns breadth, while high-impact may be deep and local.

high-impact project
The high-impact project connected every village clinic to clean water.
high-impact decision
Moving the stop closer to the hospital was a high-impact decision.
high-impact work
High-impact work can begin with one carefully measured improvement.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.