ɪmˈpɹɑbəbl̩ ɪmˈpɹɒbəbl̩ ˈmɑːvələs ˈmɑɹvələs ˈmɑɹvələs tɔːl tɔl ˌʌnbəˈliːvəbl̩ ʌnˈlaɪkli too improbable to admit of belief a tall story not likely to be true or to occur or to have occurred legislation on the question is highly unlikely an improbable event having a probability too low to inspire belief