In dubitably is an adverb that means "without doubt" or "undoubtedly." Its antonyms, or opposite meanings, include "doubtfully," "uncertainly," "questionably," "dubiously," "skeptically," and "hesitantly." These words convey a sense of doubt, suspicion, or disbelief, suggesting that something is not fully established or proven. For example, "The jury was in dubitably convinced of the defendant's guilt" can be rephrased as "The jury was doubtfully convinced of the defendant's guilt," which indicates a lack of certainty or confidence in the verdict. Knowing the antonyms of a word can help refine one's vocabulary and understanding of its nuances and shades of meaning.