ADJ-GRADED
(聯系)脆弱的;(理由)站不住腳的，牽強的;(地位)不穩固的
If you describe something such as a connection, a reason, or someone's position as tenuous, you mean that it is very uncertain or weak.
例句
The cultural and historical links between the many provinces were seen to be very tenuous...
許多省份之間的文化和歷史紐帶被認為是很脆弱的。
This decision puts the President in a somewhat tenuous position.
這個決定使得總統的位置有些岌岌可危。