Straight, upright and level
straight adjective
in the correct position and not leaning to one side or the other
upright adjective
straight and tall
level adjective
flat, not sloping up or down
flat adjective
level and parallel to the ground
vertical adjective
standing, pointing, or moving straight up. Something that is horizontal is parallel to the ground or its base
horizontal adjective
straight and parallel to the ground
perpendicular adjective
completely upright and straight
erect adjective
in a straight upright position
square adjective
straight, or parallel with something straight
true adverb
in a completely straight line towards the intended place