erratically adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

Is erratic an adjective?

erratic. / (ɪˈrætɪk) / adjective. irregular in performance, behaviour, or attitude; inconsistent and unpredictable. having no fixed or regular course; wandering.

Is any adjective or adverb?

as an adverb (usually followed by the comparative form of an adjective or adverb): Are you feeling any better? Any is used especially in questions, in negative sentences, and in clauses with 'if': Is there any coffee left? There weren't any complaints. I can lend you a map if that's any help.