unseriousness Synonyms

Strongest:

not serious

The politician's unseriousness regarding the crisis drew widespread criticism.
The team's unseriousness in training led to their dismal performance in the tournament.
Despite the gravity of the situation, their unseriousness betrayed a lack of concern.
The student's unseriousness resulted in failing grades and academic probation.
The company's unseriousness towards safety regulations posed a serious risk to employees.
The candidate's unseriousness during the interview made a negative impression on the hiring manager.
The seriousness of the problem demanded immediate action, but their unseriousness prevented any progress.
The comedic actor's unseriousness enhanced the entertainment value of the film.
The project's success depended on professionalism, but their unseriousness threatened to derail the effort.
The relationship suffered due to one partner's unseriousness and unwillingness to commit.

not serious

superficiality, frivolousness, frivolity, flightiness, facetiousness, lightness, levity, lightheartedness,flippancy, gayety

gravity, earnest, humorlessness,seriousness, earnestness, gravitas, solemnity, resoluteness, deliberation, decisiveness

The politician's unseriousness regarding the crisis drew widespread criticism.

The team's unseriousness in training led to their dismal performance in the tournament.

Despite the gravity of the situation, their unseriousness betrayed a lack of concern.

The student's unseriousness resulted in failing grades and academic probation.