Perpendicular (5)
'perpendicular' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for upright that I've seen before include "Pig hurt (anag) -- noble" , "Erect - post" , "Moral" , "deserving respect" , "Key item" .)
'perpendicular' is the definition.
(I know that perpendicular can be written as vertical)
This is all the clue.
(Other definitions for vertical that I've seen before include "At right angles to the horizontal" , "At right angles to the base line" , "Straight up" , "Upright, perpendicular" , "Absolutely upright" .)
'perpendicular' is the definition.
(synonyms)
This is all the clue.
(Other definitions for sheer that I've seen before include "Very steep or diaphanous" , "Downright - deviation" , "Utter - precipitous" , "Very thin and fine" , "Unmitigated; perpendicular" .)
(Other definitions for plumb that I've seen before include "Connect pipes" , "Lead weight for testing depth or the perpendicular" , "Reach or experience, say the depths" , "Take soundings at sea" , "Going straight up and down" .)