This is the 11194th most frequent Russian word.
громадный
Huge; enormous.
Here, 'громадный' is used as an adjective to describe the size of an object, meaning 'enormous' or 'huge'.
Этот дом громадный.
This house is enormous.
In this sentence, 'громадное' modifies 'количество', emphasizing the large extent of the workload.
У нас сейчас громадное количество работы.
We have an enormous amount of work right now.
'Громадный' here is describing the immense degree or magnitude of one's talent, highlighting its impressiveness.