|dīə|me.trik, -rēk adjective
or di·a·met·ri·cal -rə̇kəl, -rēk-
Etymology: Greek diametrikos, from diametros + -ikos -ic, -ical
1. : diametral 1
2. : completely opposed or opposite as if at the opposite end of a diameter
in diametric contradiction to his claims