spindly

那株植物的茎干细长脆弱，看起来难以支撑其自身重量。

The plant's ___spindly stems look too fragile to support its weight.

那株幼苗的茎干细长脆弱，似乎风一吹就会折断。

The ___spindly stem of the seedling looked so fragile that it might break in the wind.