impotence...

...is searching through the depths of your mind for the word or words you need to suddenly be human, to be able to communicate, and being unable to find it or them. It is the powerlessness and frustration that comes with scrambling through your memory, grasping desperately at syllables and letters and sounds, hoping that eventually your thoughts will become clear, but knowing that most likely, they will remain firmly, inexpressibly in your head.