非驴非马

Explanation: Is not a donkey nor a horse. Metaphor nondescript, nothing like. 　　Usage: Joint type; as predicate, adverbial, complement; often used in conjunction with the nondescript 　　Source: Han Ban Gu "Han Western Regions under the Drainage plow": "non-donkey donkey, horse not a horse, if the king of Kucha, the so-called mules also." 　　Examples: And commander in chief to Xunan Shi Qu, posters and abroad, ~, appalled. (Caidong Fan, Xu Jin Father "Romance of the Republic of the popular" Sixth nine back) 　　Riddle: Mule; five Unlike Thesaurus:  And a half is not sector, Semi-semi-circles, Feisengfeisu, Monk is not impressive