tenuous
adjective uk/ˈten.ju.əs/ us/ˈten.ju.əs/
（关系、想法、形势等）不确定的，不明朗的
A tenuous connection, idea, or situation is weak and possibly does not exist.
The police have only found a tenuous connection between the two robberies. 我们只能认定这两桩抢劫案之间可能有某些联系。
literary纤细的；单薄的；脆弱的
thin, weak, and easily broken