When it comes to doing something without checking, there are various synonyms that can be used to convey the same meaning. Some of the synonyms for this phrase include: blindly, carelessly, haphazardly, recklessly, thoughtlessly, mindlessly, inattentively, negligently, heedlessly, and spontaneously. These words all depict a lack of checking or attention to detail, and suggest that something is being done quickly or impulsively without consideration. It is important to be cautious when doing something without checking, as it can lead to mistakes or errors that may be difficult to correct later on. Using these synonyms can help to add variety to your language, while still conveying the intended meaning.