If "अभूतपूर्व" refers to something unprecedented or never before seen:
* सामान्य (sāmānya): meaning ordinary or common
* परिचित (parichit): meaning familiar or known
* पूर्व (pūrva): meaning previous or past
* पुराना (purānā): meaning old or antique
If "अभूतपूर्व" refers to something extremely large or significant:
* छोटा (chhoṭā): meaning small
* मामूली (māmūlī): meaning insignificant or trivial
If "अभूतपूर्व" refers to something exceptional or extraordinary:
* साधारण (sādharan): meaning ordinary or average
* सामान्य (sāmānya): meaning common or usual
Ultimately, the best opposite for "अभूतपूर्व" will depend on the specific context in which it is used.