Antonyms for "striking terror in" would include "reassuring," "comforting," "calming," and "soothing." Instead of causing fear, these words suggest a sense of safety and security. Other antonyms might include "encouraging," "inspiring," and "uplifting," which all imply positive emotions and feelings. When someone or something is striking terror, it often means that they are intimidating, threatening, or dangerous. The opposite of this would be to create a sense of welcoming, friendliness, and peace. These words can be used to describe actions, situations, or people who have a calming effect and ease any sense of fear or anxiety.