Unreassuring, the word that describes something that doesn't offer comfort or security, has a few different antonyms to consider. On the opposite end of the spectrum, we have reassuring, which implies that something provides comfort or relief. Other antonyms for unreassuring include calming, soothing, and comforting, all suggesting that whatever is being described is capable of reducing anxiety or unease. We could also use dependable, trustworthy, or reliable, as they all indicate that something is stable and predictable. Lastly, we have confident, which suggests a positive assurance in oneself or one's abilities. By using any of these antonyms, we can better convey the precise meaning we intended.