Synonyms of 'behemoth'
giantDictionary, monster, mammothThe city is a sprawling behemoth with no heart.
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A leviathan is something which is extremely large and difficult to control, and which you find rather frightening.
It's a leviathan of a book.
He said he'd hooked a real monster of a fish.
Thesaurus for behemoth from the Collins English Thesaurus
If you refer to something as a behemoth , you mean that it is extremely large, and often that it is unpleasant , inefficient , or difficult to manage .