若隐若现

Explanation: Vague, not clear. 　　Usage: Joint type; as predicate, attributive, adverbial; describe the fuzzy memory 　　Source: Tang Tang Taizong "big Zang holy church order": "No Off No students, instead of the ancient calendar Qianjie; looming, and long this blessed operation." Thesaurus:  Ruoyouruowu, loom, Ruocunruowang