doubly

Used to emphasize a high degree of certainty, often by checking something again.

Used to emphasize that something is very important, or important for two reasons.

Used to emphasize that a statement is particularly true, or true for two separate reasons.

Used to emphasize that something is very difficult, or difficult in two ways.

Used to emphasize that something is very interesting, or interesting for two reasons.

Used to emphasize that a situation is very unfortunate, or unfortunate for two reasons.

Used to emphasize that a situation is very ironic, or ironic in two ways.