Intense (4)
'intense' is the definition.
(associated in meaning)
This is all the clue.
(Other definitions for deep that I've seen before include "greatly involved?" , "Extending far down" , "Heartfelt" , "Profound - cunning - sea - bass" , "profoundly" .)
'intense' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for extreme that I've seen before include "Going beyond moderation" , "Exceptional - radical" , "Meet Rex (anag.)" , "Harsh" , "end" .)
'intense' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for vehement that I've seen before include "Forceful, emphatic" , "Burning" , "Zealously forceful" , "Even them being intense, showing strong feeling" , "Showing strong feeling, intense in speech" .)
'intense' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for profound that I've seen before include "deeply intellectual" , "Showing great insight" , "Needing deep thought" , "showing great knowledge" , "Overpowering" .)
(Other definitions for terrific that I've seen before include "Informally excellent - really great" , "Wonderful, marvelous" , "Fit crier being excellent" , "'Marvellous, wonderful (8)'" , "Marvellous, excellent" .)
'intense' is the definition.
(synonyms)
This is all the clue.
(Other definitions for acute that I've seen before include "Piercing" , "Excruciating" , "Urgently pressing" , "less than right" , "Sharp or crucial" .)
'intense' is the definition.
(I know that intense can be written as vivid)
This is all the clue.
(Other definitions for vivid that I've seen before include "Brilliantly coloured - full of life" , "Very bright and colourful" , "Graphic" , "Intense" , "Presenting a clear and striking picture" .)
'intense' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for severe that I've seen before include "Harsh; very plain" , "'Strict, harsh (6)'" , "Taxing" , "Strict and unbending" , "Hard to endure" .)