From Wiktionary, the free dictionary
From Old Tamil 𑀓𑀝𑀼 (kaṭu). Cognate to Tamil கடு (kaṭu).
കടു • (kaṭu)
- extreme, excessive, fierce, impetuous
- Gundert, Hermann (1872) “കടു”, in A Malayalam and English dictionary, Mangalore, London: C. Stolz; Trübner & Co.