Great

adj.joyful, capableeveryday

Meaning 1

Notably better, more useful, or more enjoyable than ordinary.

Reach for it when giving broad enthusiastic approval in everyday language

The new ramp is a great improvement for families with strollers.

playful
fantastic
high-energy praise fits the audience
not when It may sound inflated in a formal performance review.
warm
wonderful
the result brings personal delight or affection
not when Wonderful can feel emotional when practical quality is the point.
professional
excellent
quality needs credible, measured praise
not when Excellent is more precise but less conversationally enthusiastic.
professional
impressive
achievement, skill, or scale earns admiration
not when Impressive describes your reaction and does not always mean beneficial.

Large in scale, degree, importance, or influence.

Reach for it when describing magnitude or consequence rather than quality

The bridge has great importance for the isolated farms.

professional
major
importance within a system or decision is central
not when Major may mean category or rank rather than sheer scale.
formal
considerable
a measured but substantial degree is meant
not when Considerable avoids claiming exceptional quality.
literary
immense
scale is vast enough to inspire emphasis
not when Immense can exaggerate an important but bounded effect.
literary
profound
depth of effect or significance is unusually strong
not when It is wrong for physical size or a merely large quantity.

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