tīvra
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fierce — SB 3.13.31
tīvra-oghām
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with unrelenting force — SB 4.12.11
tīvra-śoka
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caused by intense grief — SB 3.28.32
tīvra-tapāḥ
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highly elevated due to undergoing fierce austerities and penances — SB 6.17.7
tīvra-tapasā
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by severe austerities — SB 7.9.35
tīvra-tejasam
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exposing His great spiritual effulgence — SB 7.8.37-39
tīvra-yoga
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severe austerities — SB 4.8.31