迟迟 (chí chí) is an adverb meaning 'slowly' or 'tardily', but specifically for an expected action that is overdue — it carries a sense of delay beyond what is normal or hoped for. It always precedes the verb it modifies (e.g., 迟迟没有完成). This is different from 迟 (chí, adj., 'late') which describes a person or event as late, and 晚 (wǎn, adj./adv., 'late') which is the general word for lateness in time.