The antonyms for "thunder against" could include phrases like "agree with," "support," "embrace," or "champion." Instead of fiercely opposing or rebelling against something, these words suggest a willingness to work in partnership or give affirmative support. Antonyms could also revolve around more passive or neutral phrasing, such as "remain neutral," "withold opinions," "abstain from," or simply "stay silent." Depending on the context, these phrases could be interpreted as a sign of indifference, restraint, or a deliberate choice not to oppose something that might otherwise be controversial.