1. A person who frequently misses work, school, or appointments without justification
He is a faltoso student who never attends classes.
Ele é um aluno faltoso que nunca comparece às aulas.
2. Someone who is unreliable or does not fulfill their commitments
My colleague is faltoso and often misses important meetings.
Meu colega é faltoso e frequentemente falta a reuniões importantes.