Powerful is not the best way to define the beings who comprise the Justice League, nor is it the most effective. I can redefine the parameters and make an allowance for every member of the League to be a power in their own right and uniquely qualified to be solving whatever problem is being presented.
https://www.quora.com/Justice-League-Who-is-the-most-powerful-among-the-initial-JLA-line-up
The Most Valuable & Least Valuable Justice League Team Members Of All Time | All Access | SPIKE. The Most Valuable & Least Valuable Justice League Team Members Of All Time. This week sees the release of DC Comics' new series Justice League of America #1 and JLA: Vibe #1. In Justice League of America, the United States government creates a version of the League that answers only to them. JLA: Vibe focuses on one of the members, a reboot of a classic member from the early 80s Detroit incarnation of the Justice League.
http://www.spike.com/articles/5ah180/all-access-weekly-the-most-valuable-least-valuable-justice-league-team-members-of-all-time
News for Fans. Wonder Woman and Justice League Debut San Diego Comic-Con Trailers. DC’s upcoming movies made quite the splash during this morning’s massive Warner Bros. Hall H panel, giving fans their first look at next year’s Wonder Woman and in a...
http://www.dccomics.com/characters/justice-league
In terms of purely physical power, stamina, endurance, ability to deliver destruction at an epic scale, there is no one in the Justice League able to match Superman, period. His powers make easily the most powerful member of the Justice League in terms of destructive capacity. He has 90% of all of the physical abilities of the remainder of the Justice League (depending on the incarnation, period of publication, and the like).
https://www.quora.com/Justice-League-Who-is-the-most-powerful-among-the-initial-JLA-line-up
JUSTICE LEAGUE ACTION producers gave Comic-Con 2016 attendees a first look at the highly anticipated Warner Bros. Animation series coming soon to Cartoon Network. During the show’s Thursday, July 21 panel, which also included voice cast members Kevin Conroy and Diedrich Bader, attendees were...
http://www.dccomics.com/characters/justice-league
1 Superman and Doomsday battle for a half an hour, trading blows which could crack the crust of the planet. The shockwaves tore down buildings around them.  Superman is the most powerful member of the Justice League by far in terms of destructive capacity and defensive capability. Super-strong, super-fast, invulnerable, indefatigable, unrelenting, irresistible, incorruptible unstoppable; these are the words that define what Superman brings to the Justice League.
https://www.quora.com/Justice-League-Who-is-the-most-powerful-among-the-initial-JLA-line-up
Last of the 1960s recruits to the Justice League, Black Canary is the daughter of the original character to bear that name. Originally, the writers of the Justice League of America comic wanted the original Canary to join the League only to realize her advanced age would be a problem.
http://comicartcommunity.com/2014/07/top-10-justice-league-members/
Top 10 Justice League Members. Top 10: Justice League Members by Jerry Whitworth. With filming beginning already on Batman v Superman: Dawn of Justice and the announcement of a Justice League film being produced directly afterward, a lot of focus has been placed on the super group in recent memory.
http://comicartcommunity.com/2014/07/top-10-justice-league-members/
With such a powerful group, the Justice League fought the worst of the worst as foes like Starro, Amazo, Despero, Doctor Destiny, Felix Faust, Lord of Time, Queen Bee, and the Crime Syndicate not only threatened the League but many times the world.
http://comicartcommunity.com/2014/07/top-10-justice-league-members/
The Most Valuable & Least Valuable Justice League Team Members Of All Time. by Kevin Marshall February 22, 2013 at 12:00AM | Views: 5,472. This week sees the release of DC Comics' new series Justice League of America #1 and JLA: Vibe #1.
http://www.spike.com/articles/5ah180/all-access-weekly-the-most-valuable-least-valuable-justice-league-team-members-of-all-time
most powerful justice league members
Superman is the most powerful Justice League member. The most powerful justice league member is Superman.