Comparative evidence

ḱremh₂

• OInd. śram- 'be weary' (Whitney 1885: 178); 'be tired'; 'make effort', 'exert one's self' (esp. in performing acts of austerity), 'labour in vain' (MW: 1096)

References

MW = Monier-Williams, M. 1899. A Sanskrit-English Dictionary. Clarendon Press.
Whitney 1885 = Whitney W. D. 1885. The roots, verb forms and primary derivatives of the Sanskrit language. A supplement to his Sanskrit grammar. Leipzig.