
rhythmisch
rhythmic
Happening in a regular, repeating beat or pattern; having a rhythm.
Die Tänzer bewegten sich rhythmisch zur Musik.
The dancers moved rhythmically to the music.
rhythmic
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rhythmic
Happening in a regular, repeating beat or pattern; having a rhythm.
Die Tänzer bewegten sich rhythmisch zur Musik.
The dancers moved rhythmically to the music.
'Rhythmisch' (rhythmic) is the adjective formed from the noun 'der Rhythmus' (rhythm). The ending '-isch' is often used to form a related adjective from a noun.
Der Sprecher hatte einen sehr angenehmen Rhythmus in seiner Stimme.
The speaker had a very pleasant rhythm in his voice.
'Rhythmisch' (rhythmic/rhythmically) can describe a noun (as an adjective) or a verb (as an adverb). As an adverb, it remains unchanged and describes the manner of an action.
Die rhythmische Musik lud zum Tanzen ein.
The rhythmic music invited people to dance.
'Rhythmisch' (rhythmic/rhythmically) is often used with verbs of movement (dancing, clapping, nodding) or recurring sounds (dripping, pounding). A well-known fixed collocation is also 'Rhythmische Sportgymnastik' (rhythmic gymnastics).
Er klopfte rhythmisch mit dem Stift auf den Tisch.
He tapped the pen rhythmically on the table.
regular
Regelmäßig and rhythmisch can both describe a stable sequence over time. Regelmäßig mainly emphasizes equal intervals between movements or sounds. Rhythmisch highlights a perceptible beat or a repeated rhythmic pattern.

Die Maschine klopft rhythmisch in einem deutlich hörbaren Takt.
The machine knocks rhythmically in a clearly audible beat.
Die Maschine klopft regelmäßig alle zwei Sekunden.
The machine knocks regularly every two seconds.