/,ʌn'stʌk; ʌn`stʌk/
adj
1 not stuck or glued on or together; detached 未粘住的; 未附着的; 松开的
*The (flap of the) envelope was unstuck. 信封（的封口）没粘住.
2 (idm 习语) ,come un`stuck (infml 口) be unsuccessful; fail 不成功; 失败
*His plan to escape came badly unstuck. 他想逃走的打算完全吹了.

adj
come unstuck
a)BrE informal if a person, plan, or system comes unstuck, they fail at what they were trying to achieve
　a dangerous area of rock where many climbers come unstuck
b) if something comes unstuck, it becomes separated from the thing that it was stuck to