The spelling of "diddlier" is perplexing for some. To start, it is important to note that "diddly" is pronounced /ˈdɪd.li/ whereas "diddlier" is pronounced /ˈdɪd.li.ər/. The tricky part is adding the suffix "-ier" which means "more". In this case, it is used to indicate "more diddly", giving us "diddlier". While the spelling may be confusing, the pronunciation follows regular English phonetic rules.