trifler
/ˈtraɪflər/
noun
- A person who treats serious matters lightly or without proper respect; someone who wastes time or acts frivolously.
- The old professor had no patience for triflers who came to class unprepared.
- She was dismissed as a trifler who never finished any project she started.
- Don't be a trifler with your responsibilities; your team depends on you.
Synonyms