One word for warm, sincere, and friendly is gracious.
The word you are looking for is likely "affable." This term describes someone who is warm, sincere, and friendly in their interactions with others.
To be cordial is to be courteous, gracious and sincere (it derived from a French word meaning 'of or from the heart)
many waters warm freindly
OK THEN THAT IS REALLY SINCERITY
The root word is the adjective sincere.
The superlative degree of word sincere can be most sincere ,or sincerest according to its use in the sentence.
there are over 48 entry's for the word friendly and one is faithful
The superlative degree of word sincere can be most sincere ,or sincerest according to its use in the sentence.
A sincere person is always respected for his sincerity. This is the sincere approach to make a sentence with the word 'sincere'.he was sincere in his efforts to please
The word 'sincere' is not a noun, sincere is an adjective, a word to describe a noun. The noun form for sincere is sincereness, an abstract noun. Another abstract noun form is sincerity.
The way you have it spelled in your question is as good as any - it's not really a word. Sincere is a word who's comparative and superlative are : more sincere, most sincere.
She was sincere and honest.
The Sanskrit word for sincere is "ईमान्दार" (īmāndār).