This one will be interesting. There will be disagreement on underrated: either an actor is rated, or not good enough to be considered underrated.
I'll start with two:
Mark Strong (literally every movie he is in, I'm asking myself why he doesn't play a lead more often)
Ben Foster (he's had lead roles - that one space horror comes to mind - but I feel he's not given his due)
I've been trying to think of an actress that would fit this category, but they're either hot, and therefore not underrated, or a good actress and therefore not underrated. It seems easier to think of overrated actress, for some reason. That most films fail the Bechdel test doesn't help.
Maybe Anna Torv?
I'll start with two:
Mark Strong (literally every movie he is in, I'm asking myself why he doesn't play a lead more often)
Ben Foster (he's had lead roles - that one space horror comes to mind - but I feel he's not given his due)
I've been trying to think of an actress that would fit this category, but they're either hot, and therefore not underrated, or a good actress and therefore not underrated. It seems easier to think of overrated actress, for some reason. That most films fail the Bechdel test doesn't help.
Maybe Anna Torv?