Sam was very orthodox. This was in opposition to his roommate, who was very what?\nOptions:\n- liberal\n- heretical\n- recalcitrant\n- conservadox\n- catholic.
Think hard. Detailed solution:
liberal
The opposition of an orthodx person is a liberal person.

Liberal person belives in new things and changes unlike an orthodox person who has backward thinking.

.

The final answer: liberal