What does lamentable mean in romeo and Juliet?

Answer 1

It's only used once, in this speech by Capulet, shortly after Juliet is discovered to be apparently dead.

Dry up your tears, and stick your rosemary

On this fair corse; and, as the custom is,

In all her best array bear her to church:

For though fond nature bids us an lament,

Yet nature's tears are reason's merriment.

A lament is something you say or sing to express your grief and sadness at the death of someone (or something) you love.

Answer 2

It means that the action is the type of story to make you want to lament. A lament is a poem or song mourning someone who is dead. There are plenty of dead people to lament in the play.