Impressive
Part of speech: adjective
Definition: Making, or tending to make, an impression; having power to impress; adapted to excite attention and feeling, to touch the sensibilities, or affect the conscience; as, an impressive discourse; an impressive scene. Capable of being impressed. appealing
Example sentence: There are few more impressive sights in the world than a Scotsman on the make.
Effective
Part of speech: adjective
Definition: Having the power to produce an effect or effects.Producing a decided or decisive effect.Efficient, serviceable, or operative.Actually in effect.
Example sentence: The medical literature tells us that the most effective ways to reduce the risk of heart disease, cancer, stroke, diabetes, Alzheimer's, and many more problems are through healthy diet and exercise. Our bodies have evolved to move, yet we now use the energy in oil instead of muscles to do our work.