他满怀希望加入这个组织，但最终只感到深深的幻灭。

He joined the organization with high hopes, but ended up feeling only deep ___disillusionment.

当他发现这份工作远不如宣传的那样好时，他感到深深的幻灭。

He felt deep ___disillusionment when he realized the job was far from what was advertised.