Superlative form of darling: most darling.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "darlingest" in a sentence
"So although she is the darlingest thing, and is certainly as sweet as pie in most respects - she will always say please and thank you and excuse me, as she rushes past you to grab your handbag in her search for candy or car keys, and will always insist upon cleaning up the poo she has inexpertly deposited in exactly the wrong location CLEAN UP!"
"Two teenage girls intercept the letters and write such steamy replies ( "My darlingest Johanna ...") that the maid shows up at the man's door, expecting to be wed."
"She has the darlingest new basket-carriage — if she only looked like anything when she rode in it."