
kraftvoll
powerful
Full of physical strength, energy, or force.
Der Schmied schlug mit einem kraftvollen Hieb auf das glühende Eisen.
The blacksmith struck the glowing iron with a powerful blow.
powerful
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powerful
Full of physical strength, energy, or force.
Der Schmied schlug mit einem kraftvollen Hieb auf das glühende Eisen.
The blacksmith struck the glowing iron with a powerful blow.

powerful
Having a strong effect or strong expression; expressive or convincing.
Sie hielt eine kraftvolle Rede, die alle Zuhörer bewegte.
She gave a powerful speech that moved all the listeners.

strong / intense
Having an intense taste, smell, or color.
Der Rotwein überzeugte durch sein kraftvolles Aroma.
The red wine impressed with its strong aroma.
The word is built simply: it consists of the noun 'die Kraft' (strength/power) and the ending '-voll' (-ful). So it literally means 'full of strength'.
Mit einer kraftvollen Anstrengung schaffte er es über die Ziellinie.
With a powerful effort, he made it across the finish line.
In relation to physical strength, 'kraftvoll' (powerful) is often combined with nouns such as 'Bewegung' (movement), 'Schlag' (blow/punch), 'Tritt' (kick), or 'Sportler' (athlete).
Der Boxer landete einen kraftvollen Treffer.
The boxer landed a powerful hit.
When it comes to expressiveness, 'kraftvoll' (powerful) often describes nouns such as 'Stimme' (voice), 'Rede' (speech), 'Sprache' (language), 'Musik' (music), or 'Bild' (picture, in the sense of a work of art).
Der Dirigent führte das Orchester zu einer kraftvollen Interpretation des Stücks.
The conductor led the orchestra in a powerful interpretation of the piece.
For sensory impressions, 'kraftvoll' (strong/intense) describes intense aromas, tastes, or colors. Typical nouns are 'Geschmack' (taste), 'Aroma' (aroma), 'Duft' (scent), or 'Farbe' (color).
Der Käse hat einen sehr kraftvollen Geschmack.
The cheese has a very strong taste.
strong
Stark and kraftvoll can describe a noticeable effect. Stark is more general and mainly indicates a high degree. Kraftvoll additionally emphasizes energy, force, or a convincing quality of expression. Kraftvoll is therefore especially appropriate when the nature of the effect is important.

Ihre kraftvolle Stimme verlieh der Rede einen überzeugenden Ausdruck.
Her powerful voice gave the speech a convincing quality.
Ihre starke Stimme war noch in der letzten Reihe deutlich zu hören.
Her strong voice could still be clearly heard in the back row.