What adjective describes someone who is dedicated and serious?

The adjective "committed" effectively describes someone who is dedicated and serious about their responsibilities, goals, or tasks. A committed individual demonstrates a high level of engagement and loyalty, consistently prioritizing their commitments and putting in substantial effort to achieve their objectives. This term encapsulates not just the willingness to be involved but also an unwavering dedication to follow through, making it synonymous with seriousness and a strong sense of purpose.

In contrast, "focused" implies concentration on a particular task or goal, while "steadfast" conveys a sense of unwavering reliability and support. "Determined" refers to being resolute and persistent in achieving something, often in the face of obstacles. While these words also convey dedication, "committed" most directly embodies the idea of serious devotion to a cause or responsibility.