obsolete - a. 한물간, 퇴행의

• archaic
• outdated
• out of date
• ancient
• outworn;out of use
• unused
• dead
• disused
• superseded

• It seems to me an obsolete speculation, but it implies no moral delinquency.
• I thought that modern mines, along with advanced detection and hull technologies would have made the wooden minesweeper obsolete by now.
• That is an obsolete expression.