The word 'wonky' typically refers to something that is off-kilter, unstable, askew, or crooked. However, there are several synonyms to describe this state - wobbly, shaky, unsteady, shaky, rickety, unstable, dicky, uneven, lopsided, slanted, skewed, askew, off-center, unbalanced, cockeyed, tilted, twisted, contorted or malformed. Some of these words have a more negative connotation, such as 'twisted' and 'contorted', whereas others may imply only a minor deviation from the norm, like 'askew' or 'slanted'. Whatever the degree of wobbliness, there will be a synonym to help you describe it accurately.