adjective
strong, powerful
B1
kräftig: adjective meaning 'strong' or 'powerful', used to describe force, flavor, color intensity or health. Gradable: comparative kräftiger, superlative am kräftigsten. Antonym schwach. Not a participle; standard adjective endings apply. No special prepositions or auxiliary verbs. Forms follow regular declension; gender agreement with noun required.
Examples
Er ist ein kräftiger Mann, der viel Kraft hat.
He is a powerful/robust man who has a lot of strength.
Der kräftige Wind schaukelte die Äste.
The strong wind shook the branches.
Der Sportler trainierte kräftig, damit er beim Wettkampf besser abschnitt.
The athlete trained vigorously so that he performed better at the competition.
Details
Mnemonics
Imagine strong muscles or a powerful engine to remember kräftig
think 'kraft' = power (English/German similarity)
N/A
Notes
kräftig describes physical strength or intensity (e.g., kräftiger Geschmack = strong flavor). It is gradable.