skittish

这只小猫对陌生人的声音很敏感，总是显得很紧张。

The kitten is very ___skittish around unfamiliar voices.

这匹马对新环境很紧张，容易受惊。

The horse is ___skittish around new environments and startles easily.

这些小狗特别活泼，整天在院子里蹦蹦跳跳。

The puppies were feeling ___skittish, bouncing around the yard all day.