Antonyms for the phrase "changed mind" include "determined opinion," "firm belief," and "unchangeable viewpoint." These words imply that one's initial stance on a particular issue has remained consistent and resolute. Other antonyms for "changed mind" might include "unwavering conviction," "steadfast attitude," and "unswerving position." These terms describe a viewpoint that is staunchly upheld, without any signs of doubt or hesitation. While changing one's mind can be seen as a sign of flexibility or open-mindedness, holding steadfast to a set of beliefs can also be a sign of strength and character.