The only context I could image "to be feared dead" to make any sense in would be for example: "Pete has been missing for over 6 weeks now, and he is feared (to be) dead". Basically if people don't know your whereabouts and seriously believe you may be dead, you would be feared to be dead.
It means the dog is more likely to harm you than the lion which is dead.
He feared/ he was afraid.
It depends on what war you mean. Bombs, nuclear to be precise, were some of the most feared weapons. Tanks also were feared highly.
What do mean
It means 'a greatly feared king'.
People fear death; thus they feared the Greek god of the dead and death, Hades.
It means 'a greatly feared king'.
72 people are still reported missing but eight of those are feared dead
It's feared that their are 100,000 people dead or there could be even more!
Hamlet
the dead is dead