Impotent and Important are easily confused words. The spell-check of most word processing software programs would not catch a slip-up among these three words. As long as it’s a word and it is spelled correctly, spell-check keeps on scanning the document.
Impotent is an adjective, it means powerless or ineffective. It can also mean sterile.
Important is an adjective, meaning something possessing significance entitlement.
The following sentence uses both words correctly:
Deep down, Ima felt impotent in her role at the new company; she concealed it with an austere manner and communicated as if she always had something extremely important to say.