表示對一啲嘢嘅質疑、不能想象，認為嗰樣嘢唔合理，亦都可以表達唔接受現實嘅情緒 (used to describe something unexpected, unreasonable or illogical, or to express denial to the reality; "it can't be!", "surely not!")
語句我冇理由會輸畀佢。
ngo5 mou5 lei5 jau4 wui5 syu1 bei2 keoi5.
It is impossible for me to be beaten by her.
表示對一啲嘢嘅質疑、不能想象，認為嗰樣嘢唔合理，亦都可以表達唔接受現實嘅情緒 (used to describe something unexpected, unreasonable or illogical, or to express denial to the reality; "it can't be!", "surely not!")
語句我冇理由會輸畀佢。
ngo5 mou5 lei5 jau4 wui5 syu1 bei2 keoi5.
It is impossible for me to be beaten by her.
Original phonetic: /mou̯¹³ lei̯¹³ jɐu̯²¹/
it is unreasonable; it is impossible; it cannot be
你自己闖禍，冇理由要人哋幫你執手尾。
You're the one who got into trouble. It's unreasonable for others to pick up after you.
我琴日先至入油之嘛，冇理由咁快冇晒油㗎。
I just refueled my car yesterday. It is impossible that my tank is almost empty this quickly.
Original phonetic: mou5 léi5 yeo4
没有道理
佢～噉做。
他没有理 由这么干
不可能
佢～唔去 。
他不可能不去