This is the 10386th most frequent Portuguese word.
exigentes
Demanding.
In this sentence, 'exigentes' describes the teachers as being rigorous or strict in ensuring deadlines are met.
Meus professores são muito exigentes com os prazos das tarefas.
My teachers are very demanding with the deadlines for assignments.
Here, 'exigentes' refers to the high standards or expectations the customers have regarding the store's products.
Os clientes dessa loja são tão exigentes que sempre pedem produtos de alta qualidade.
The customers of this store are so demanding that they always request high-quality products.
In this usage, 'exigente' suggests being disciplined or having high standards towards oneself in order to succeed.