From Wiktionary, the free dictionary
From Sanskrit कठिन (kaṭhina).
கடினம் • (kaṭiṉam)
- hardness, firmness
- difficulty
- severity, cruelness, harshness
- roughness, ruggedness
- University of Madras (1924–1936) “கடினம்”, in Tamil Lexicon, Madras [Chennai]: Diocesan Press