Weary

From YPPedia

When a ship finishes a sea battle, it is given the status of weary. Ships that are weary cannot be attacked until the status changes. The length of the weary time depends on several factors, including whether the ship attacked another target or was attacked by them.

There is one notable exception. A ship that recently lost a PvP battle may attack the ship that attacked them. If, however, the loser was the initiator of the PvP, this does not apply.