Flat; low in height or thickness and spread out — colloquial expression meaning level or flattened.
その石は平べったくて座るのにちょうどいい。
That stone is flat and just right to sit on.
彼の財布は中身が少なくて平べったい。
His wallet is flat because it doesn't have much inside.
平べったい麺はスープとよく絡む。
Flat noodles go well with the soup.
平べったい声で話されると、感情が伝わりにくいことがある。
When spoken in a flat tone, emotions can sometimes be hard to convey.