Because people thought that Zeus might throw lightning bolt at them.
Since Zeus is a god to people in some religions, it could be called a fear of religion - Theophobia.You could probably use Hellenologophobia as well - the fear of Greek terms.Finally...and most obviously...Zeusophobia. Fear of god/gods.
no one :)
In Greek mythology, Hades feared losing control of the Underworld, as well as experiencing betrayal from other gods or from mortals seeking to escape his domain. Additionally, Hades feared challenges to his authority and power by potential adversaries.
he feared nyx
Poseidon does not fear Zeus, he respects his older brother because he is the king of the gods in Greek Mythology (Zeus is Jupiter, Poseidon is Uranus in Roman mythology).
Zeus and the gods
Zeus's lightning bolt symbolizes his strength. It was a way to get people to fear him.
In Greek mythology, Zeus did not fear any other gods or creatures. However, he was cautious of prophecies that could threaten his power and rule.
Poseidon was afraid of this brother Zeus. (actually, he was afraid of the sky, because Zeus ruled it.. )
Zeus fears of crones might rise again from the dead like in Percy Jackson and the sea of monsters!
Zeus and Posidon, his two godly brothers.
They were afraid he'd incinerate them with his lightning bolt. Also they were afraid if they flew they would get blasted out of the sky (burnt up too) because the sky was Zeus's domain, as he was the God of the Sky (heavens, or otherwise the universe)