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Use "summerly" in a sentence
"As luck would have it, the first who came to meet us at the gate was Lorna, with nothing whatever upon her head (the weather being summerly) but her beautiful hair shed round her; and wearing a sweet white frock tucked in, and showing her figure perfectly."
"The couch-bunk under the window to conceal the summerly recliner."
"The adjective is a nonce-sense, summerly elsewhere meaning 'such as one expects in summer'; the noun is a nonce-word."