Synonyms for Addled (same or very similar meaning)
WordNet sense 1 (showing deterioration from age):
staleWordNet sense 2 (confused and vague; used especially of thinking):
befuddled, muddled, woolly, wooly, muzzy, woolly-headed, wooly-mindedWordNet sense 3 (mentally confused; unable to think with clarity or act intelligently):
confusedFrom the ODE community, based on WordNetadd/edit