It went on endlessly, and became pointless. ذَهَبَتْ طُولاً، وَعَدِمَتْ مَعْقُولاً‏.‏

(This proverb is used to describe something long and useless.)
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One of the closest English equivalents of this proverb, describing someone with a large or impressive appearance but no real substance or intelligence, is:
“All height and no substance.”
Meaning: Height without value or substance.
This is very close in meaning.
“Big body, little brains.”
Meaning: Large body but little brain.
“All show and no worth.”
Meaning: Appearance without real value.
“Tall but useless.”
Meaning: Tall but useless.
This is a direct translation of the meaning.
“Empty vessels make the most noise.”
Meaning: Empty vessels make the most noise.
This is sometimes used to describe someone who appears large but is of no value.
The closest expression to the spirit of the Arabic proverb is:
“All height and no substance.”
“Tall but without substance.”
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يضرب للطويل بلا طائل‏.‏