Big beyond belief (4)
I believe the answer is:
vast
(Other definitions for vast that I've seen before include "Huge, enormous" , "'Huge, immense (4)'" , "Astronomical" , "Extremely large or extensive" , "Of very great extent" .)
I believe the answer is:
vast
(Other definitions for vast that I've seen before include "Huge, enormous" , "'Huge, immense (4)'" , "Astronomical" , "Extremely large or extensive" , "Of very great extent" .)