See Crocodile, Alligator, Dragon, and Dinosaur. A leviathan is a biblical sea monster or a large sea animal.
Positive: Dreaming of leviathan could represent God’s power over pride and the enemy.
Negative: Seeing leviathan in a dream could indicate pride, bending, crooked, meandering, snake, monster, devious, distorted, ancient, demon, or an evil creature that cannot be tamed by the natural strength of man.
(Isaiah 27:1; Job 7:12; Job 41:1-10; Psalm 74:14; Revelation 6:7).