Definition of underdress in English:

underdress

verb

[NO OBJECT]also be underdressed
  • Dress too plainly or too informally:

    ‘without a pinstripe you'd be underdressed’
    • ‘I felt terribly underdressed, in only a sweater and khaki's; I wished she had told me this was going to be formal dining.’
    • ‘Daryl felt a little underdressed in his blue jeans Led Zeppelin T-shirt and jean jacket complete with high tops.’
    • ‘We were out of breath, underdressed (no coats either) and famished, with at least two hours to kill before our key-bearing neighbours would be home.’
    • ‘I hoped I wouldn't look underdressed in my jumper and jeans.’
    • ‘Christina felt unbelievably underdressed in her worn jeans and high school sweatshirt.’
    • ‘I was wearing a pair of chinos and a (rather stylish) company polo shirt, but I felt quite underdressed as soon as I walked in the door.’
    • ‘If you are overdressed, underdressed, have on too much make-up or not enough, it can ruin your whole evening.’
    • ‘Plus, keep in mind that, as a general rule, you are always better off being slightly overdressed rather than underdressed, whatever the occasion.’
    • ‘In the work environment, it's generally better to be slightly overdressed than underdressed.’
    • ‘The man was wearing a suit, which made Josh feel underdressed in his dirty old jeans and jean jacket to match.’
    • ‘He actually felt underdressed in his nice gray suit and unbuttoned black shirt with matching shoes.’
    • ‘She felt awkward and underdressed in her black gown, but it was all that she could find and afford.’
    • ‘I felt rather underdressed in my black woolly jumper.’
    • ‘She felt too underdressed in her jeans and sweatshirt.’
    • ‘This is a neighborhood where you feel underdressed if you're not wearing a coat and tie to walk the dog.’
    • ‘However, there is nothing worse than being inappropriately underdressed at a black-tie only affair.’
    • ‘I had never felt so dressed up and underdressed at the same time.’
    • ‘And remember; when in doubt, it's usually better to be overdressed than underdressed.’
    • ‘Today, he said, it probably means a lounge suit but, he warned, always be overdressed rather than underdressed.’
    • ‘As it was an ugly day, I didn't wear a sport coat and felt a bit underdressed, even though I had on slacks, an oxford shirt and sweater vest.’

Pronunciation:

underdress

/ʌndəˈdrɛs/