Definition of "unwrinkled"

Emtie escaping, home return’d again; / A few daies after to the same place came: / Where hee beheld the Sea’s unwrinkled face, / Smile again on him with alluring Grace.

1649, Leonard Willan (translator), The Phrygian Fabulist or, The Fables of Æsop, London: Nicolas Bourn, 101. “The Shipwrackct Shepherd,” p. 84

Where pity, to the mind conveyedIn pleasure, is the darkest shadeThat Time, unwrinkled grandsire, flingsFrom his smoothly gliding wings.

1832, William Wordsworth, “The Gleaner (Suggested by a picture)”, in The Poetical Works of William Wordsworth‎, volume 3, London: Longman, Rees, Orme, Brown, Green, & Longman, page 253

His fair hair waved long and freely over a white and unwrinkled forehead: the life of a camp and the suns of Italy had but little embrowned his clear and healthful complexion, which retained much of the bloom of youth.

1835, [Edward Bulwer-Lytton], “The Knight of Provençe, and His Proposal”, in Rienzi, the Last of the Tribunes. […], volume I, London: Saunders and Otley, […], book II (The Revolution), page 184

Muley’s face was smooth and unwrinkled, but it wore the truculent look of a bad child’s, the mouth held tight and small, the little eyes half scowling, half petulant.

1939, John Steinbeck, chapter 6, in The Grapes of Wrath‎, Pengin, published 1992, page 61

The lieutenant of the watch, his telescope quite dazzling with polished brass and pipe-clayed twine, wore spotless and unwrinkled white trousers; the buttons on his well-fitting coat winked in the sunshine.

1953, C. S. Forester, chapter 9, in Hornblower and the Atropos‎, London: Michael Joseph