more stealthy than a cat أدب من ضيون

Ḍayūn: The male cat. The correct form should be Ḍayn, but this is an irregular correction. Its diminutive is Ḍayyīn, and some say Ḍayyūn. The poet said: Adab at night to his neighbor, from Ḍayūn, creeps to a farnab.
(Al-Qarnab: The mouse, or the jerboa, or the offspring of the jerboa, and its beginning is a fatha on the qāf or a kasra on the fā’)
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The proverb "more stealthy than a cat" is used to describe someone who moves and creeps furtively at night, as the word "cat" (in the verse I quoted) refers to a male cat that moves silently at night.
There is no exact English equivalent, but the closest parallels in terms of meaning and imagery are:
As stealthy as a cat.
To creep around like a cat.
To move with catlike stealth.
Like a cat stalking its prey.
So, if you want a natural English proverb that corresponds to the Arabic image, the best equivalent is:
As stealthy as a cat.
Or, if the focus is on stealthy movement at night:
He creeps around like a cat in the night.
This is closer to the meaning of “literature from Dion” as it was used among the Arabs, even if it is not a fixed, inherited English proverb.
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الضيون : السنور الذكر وكان القياس أن يقال : ضين وهذا من التصحيح الشاذ وتصغيره ضيين وبعضهم يقول : ضييون قال الشاعر :
أدب بالليل إلى جاره من ضيون دب إلى فرنب
( القرنب : الفأرة أو اليربوع أو ولد الفأرة من اليربوع وأوله قاف مفتوحة أو فاء مكسورة )

creepy than a beetleأدب من قرنبى

It is a small creature resembling a beetle
The poet said:
O servants of God, my heart is captivated by the most beautiful of those who walk, and the ugliest of them in marriage
It creeps upon her insides every night like a scorpion, climbing a flat, sandy hill
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The proverb "more creepy than a beetle" (referring to creeping, not to manners) is used to describe someone who crawls or moves slowly and stealthily, or who clings to something excessively. A beetle is a small insect similar to a lily.
There is no exact English equivalent, but the closest equivalents in meaning are:
He crawls like a beetle.
To creep around like a bug.
To cling like a limp.
To crawl on all fours.
If the intention is to convey the proverb's figurative meaning, the best equivalent is:
He creeps around like a beetle.
Or, in the context of excessive clinging:
He clings like a limp.
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وهي دويبة شبه الخنفساء
قال الشاعر
ألا يا عباد الله قلبي متيم        بأحسن من يمشي وأقبحهم بعلا
يدب على أحشائها كل ليلة      دبيب القرنبى بات يعلو نقا سهلا