estaban decepcionando
-they/you were disappointing
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verbodecepcionar.

decepcionar

Muchos lectores parecían pensar que los sistemas de educación en sus países los estaban decepcionando.
Many respondents seemed to think the education systems in their countries were letting them down.
Palabra del día
tallar