something that cannot be replaced or substituted

ऐसा जो बदल न सके

English Usage: "The unreplaceable artwork was the highlight of the exhibition."

Hindi Usage: "अद्वितीय कलाकृति प्रदर्शनी की मुख्य विशेषता थी।"

something that is unique or irreplaceable in value

ऐसा जो अद्वितीय या महत्वपूर्ण हो

English Usage: "Her advice was unreplaceable in times of difficulty."

Hindi Usage: "उसका सलाह कठिनाइयों में अद्वितीय थी।"