erectile
fastigiate
hierarchal
hierarchic
hierarchical
orthostatic
passant
plumb
prime vertical dial
rampant
rearing
semi-climbing
semi-erect
semi-upright
stand-up
standing
statant
straight
unbent
unbowed
unsloped
upended
upright
abrupt
acmatic
apical
aplomb
arrowlike
azimuth circle
bluff
bold
bolt upright
breakneck
capital
chief
consummate
dead straight
direct
downright
erect
even
flat
head
headlong
headmost
highest
horizontal
in a line
level
lineal
linear
maximal
maximum
meridian
meridional
normal
orthodiagonal
overmost
paramount
perpendicular
plunging
precipitous
preeminent
rapid
rectilineal
rectilinear
right
orientation
continuous
forward
jagged
lateral
narrow
single
upper
inclined
prostrate