This is the 14467th most frequent German word.
kontinuierlich
Continuous; ongoing; steady.
In this sentence, "kontinuierlich" is used as an adverb to describe the manner in which the action of improving occurs.
Er verbessert sich kontinuierlich in seinen Sprachfähigkeiten.
He is continuously improving his language skills.
Here, "kontinuierlicher" is an adjective modifying "Aufwand," describing the effort as being ongoing and sustained over time.
Ein kontinuierlicher Aufwand ist notwendig, um das Ziel zu erreichen.
Continuous effort is necessary to achieve the goal.
In this case, "kontinuierliches" serves as an adjective modifying "Lernen," indicating that the process of learning is ongoing and unbroken.