不成体统 [- - tǐ tǒnɡ]in a state of disorder; behave very badly; having no manners; most improper; not assume proper form; not presentable; ridiculous; unbecoming; wildly:
•¶ 她在聚会上的举止真不成体统。 She behaved very badly at the party.
•¶ 舞会上穿短裤不成体统。 Short trousers are improper at a dance.