frivol

Example:The scientist conducted his research with great seriousness and dedication.

Definition:Characterized by or expressing gravity and an absence of levity, or showing careful consideration or deliberate intent.

Example:His work is considered important by all experts in the field.

Definition:Having or relating to consequences that matter; significant.

Example:She had always been a dutiful daughter, always attending to her parents' needs.

Definition:Performing one's responsibilities faithfully and conscientiously.