Meaning of kada kathor in english
Interpreting kada kathor - कड़ा कठोर
As adverb :
hard Ex:  It's very hard to keep Bill in line .
Suggested : not soft solid and firm to the touch unyielding to pressure and impenetrable or almost impenetrable
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kada kathor
can be used as verb or adverb. No of characters: 8 including consonants matras.
Transliteration :
ka.Daa kaThora