When it comes to expressing that you have developed a thought, there are plenty of synonyms to choose from. You could say you "formulated an idea," "conjured a concept," or "crafted a notion." Other options include "shaped a perspective," "honed a theory," or "constructed a thesis." You may have "fashioned a belief," "fabricated a hypothesis," or "generated a conclusion." Alternatively, you may have "composed a plan," "devised a strategy," or "created a vision." Ultimately, the synonym you choose will depend on the context and the tone you want to convey. The important thing is to communicate that you have thought through an idea or issue thoroughly and with intention.