Definition of alas in US English:

alas

exclamation

humorous, archaic
  • An expression of grief, pity, or concern.

    ‘alas, my funds have some limitations’
    • ‘She became the most passionate wife that a man could hope that she might be, but alas.’
    • ‘Shopping, alas, is likely always to lag behind the entertainment industry.’
    • ‘We looked in vain expecting the area to miraculously improve but alas, no such luck.’
    • ‘I caught my arms around a low wall that separated the two sections of the path, but alas!’
    • ‘Oh my god, I nearly pushed her out of the way to get at him, but alas, he only had eyes for her.’
    unluckily, sadly, regrettably, unhappily, woefully, lamentably, alas, sad to say, sad to relate
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Origin

Middle English: from Old French a las, a lasse, from a ‘ah’ + las(se) (from Latin lassus ‘weary’).

Pronunciation

alas

/əˈlas//əˈlæs/