Definition of wideawake in English:

wideawake

noun

  • A soft felt hat with a low crown and wide brim.

    • ‘He continued with a description of ‘the draught-fearing Bruch, who looked like an Arctic explorer, having armed himself with galoshes, a waterproof wideawake and a thick mackintosh to combat the rigours of an English June’.’
    • ‘When a fedora, a bowler, a balmoral, a tam-o'-shanter, a Bombay Bowler, a pork-pie or a floppy-brimmed wideawake?’
    vigilant, alert, on the alert, wary, watchful, cautious, careful, heedful, chary, circumspect, on the lookout, on the qui vive, on one's toes, prepared, ready, wideawake, attentive, observant, keeping one's eyes peeled
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Origin

Mid 19th century: punningly so named, because the hat does not have a ‘nap’ or glossy surface.

Pronunciation:

wideawake

/ˈwʌɪdəweɪk/