Comparative form of tender: more tender(adjective)
One who tenders (a bid, a contract, etc.).(noun)
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Use "tenderer" in a sentence
"Although he said nothing to her that he could not have said before everybody, he felt that she was becoming more and more dependent upon him, and the more he felt this, the better he liked it, and the tenderer was his feeling for her."
"The more we are like Jesus, the more we have of his Spirit, the tenderer will be our hearts and the more deeply will our souls be moved by the sufferings of others."
"Whether I am more discriminating than I was in youth, or more narrow-minded, I cannot say, but the sad fact is that there are books I am now too old and stiff to read, which I may well have enjoyed had I encountered them in tenderer years."