NIV  You see, at just the right time, when we were still powerless, Christ died for the ungodly.

NASB  For while we were still helpless, at the right time Christ died for the ungodly.

ESV  For while we were still weak, at the right time Christ died for the ungodly.

NKJV  For when we were still without strength, in due time Christ died for the ungodly.

KJV  For when we were yet without strength, in due time Christ died for the ungodly.