unstable

US /ʌnˈsteɪ.bəl/
UK /ʌnˈsteɪ.bəl/
"unstable" picture
1.

不穩定的, 不牢固的

likely to change or give way; not stable

:
The old bridge is structurally unstable.
這座舊橋結構不穩定
The political situation in the region remains highly unstable.
該地區的政治局勢仍然高度不穩定
2.

情緒不穩定的, 反覆無常的

prone to erratic or unpredictable changes of mood or behavior

:
He's been very unstable since the divorce.
離婚後他一直很不穩定
Her emotions are quite unstable, swinging from joy to sadness quickly.
她的情緒相當不穩定,很快從快樂轉為悲傷。