mightless /ˈmaɪt.ləs/ adjective1 •Lacking in might or vigour; powerless; weak.So the mightless Tannenbaum, with two cups of wine in hand, plus a burger, chased Lilly back down as Ezra scooted into the shadows, leaving her to face the mayor all by herself. — 2004 formsmore mightless · most mightless