1. comparative form of hard; more difficult or requiring greater effort
This problem is harder than the last one.
Este problema é mais difícil que o anterior.
2. comparative form of hard; more solid, firm, or resistant to pressure
The wood becomes harder when it dries.
A madeira fica mais dura quando seca.
3. more severe, intense, or harsh
He worked harder to achieve his goals.
Ele trabalhou mais arduamente para alcançar seus objetivos.