1) Being at opposite extremes 2) Completely opposed 3) Diametral 4) Diametric 5) In direct opposition 6) Straight line 1) Diametral 2) Diametric 3) Different 4) Polar 
• (a.) Of or pertaining to a diameter. • (a.) As remote as possible, as if at the opposite end of a diameter; directly adverse.
polar adjective characterized by opposite extremes; completely opposed; `in diametric contradiction to his claims`; `diametrical (or opposite) points of view`; `opposite meanings`; `extreme and indefensible polar positions`
of, pertaining to, or along a diameter. · in direct opposition; being at opposite extremes; complete: diametrical opposites; a diametrical difference.