unstable/ʌnˋstebḷ; ʌnˈsteIb$l/adj 1 likely to change suddenly and become worse 不稳定的﹐动荡不定的: The political situation is still very unstable. 政局依然很不稳定。2 someone who is unstable is not always in control of their feelings or behaviour, especially because there is something wrong with them mentally〔情绪﹑行为〕反复无常的〔尤因有精神问题〕3 likely to fall over 易倒下的﹐不稳固的: an unstable wall 摇摇欲坠的墙