Crabbedly means in an ill-natured or grumpy manner. There are several synonyms for this word, including irascibly, sullenly, peevishly, petulantly, testily, cantankerously, crossly, snappishly, surly, and curtly. Each of these words conveys a sense of irritability or impatience, but they may differ in their intensity. For example, someone who is crabbedly might respond to a simple question in a curt, snappish tone, while someone who is irascibly might fly into a rage at the slightest provocation. Using synonyms like these can help to add variety and nuance to your writing, allowing you to convey more precisely the tone and mood of a particular situation or character.