1. A comparative conjunction used to emphasize that something is true to an even greater degree than something else, or to introduce a stronger reason or condition
He is lazy, but even more so because he lacks motivation.
Ele é preguiçoso, mas ainda que por falta de motivação.
2. Used to introduce a clause that emphasizes or strengthens a previous statement
It's difficult, all the more so because we have limited time.
É difícil, mais ainda que temos tempo limitado.