Adverb
In an impotent manner.
Source: Webster's dictionarythe crowd watched him helplessly Source: Internet
I stared aimlessly out a distant window, watching the plows impotently remove ice from the parking lot. Source: Internet
The red silk-lined black velvet very hot vampire novel series-inspired collectible cape he wore swirled around him with dark but ultimately harmless menace, only more impotently. Source: Internet