隐隐 is a reduplicated adjective/adverb meaning 'faintly, indistinctly, vaguely'. It describes sounds, feelings, or impressions that are not clear or intense — like a distant sound, a dull ache, or a vague suspicion. It often modifies verbs like 传来 (to come from afar), 感觉到 (to feel), or 作痛 (to ache). The word is literary but common in descriptive writing. Note: the gloss 'abundant' from the dictionary is outdated or incorrect; the core senses are 'faint' and 'vague'.