1. in a way that deviates from the correct or expected course; astray
2. in a manner that is mistaken or incorrect; erroneously
Usage: archaic or literary

Examples

• The ship drifted errantly through the fog without a clear heading.
• He errantly believed the old rumor without checking the facts.
• The ball bounced errantly off the wall and into the crowd.
• She spoke errantly about the historical event, mixing up several key dates.
• The compass needle pointed errantly due to the magnetic interference.
• The knight wandered errantly through the forest, lost and searching for the castle.