Meaning of (सम्प्रत्यायक) sampratyayak in english
As adjective :
convincing Ex:  Raisonnement which proves the truth of its conclusion by deduction and a clear and convincing manner
Suggested : persuading or assuring by argument or evidence
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(सम्प्रत्यायक) sampratyayak
can be used as adjective.. No of characters: 12 including consonants matras.
Transliteration :
sampratyaayaka