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Discover LudwigThe phrase "are weak of" is not correct in standard written English.
It is typically used incorrectly when trying to express a lack of strength or ability in a certain area.
Example: "They are weak of willpower when it comes to resisting temptation."
Alternatives: "lack strength in" or "are deficient in".
Dictionary
are weak of
adjective
Lacking in force (usually strength) or ability.
Exact(4)
This is in part because babies' necks are weak, of course, but also because the bones in the skull are not yet fully fused together.
In one letter, Abu Sayyaf is said to have experience in dealing with "people in the Levant who work in the field of antiquities," people who are "weak of faith".
In this case, Alzheimer's becomes a mercy from God, especially to those who are weak of heart.
"Zaydi, Shafei, Sunni, we are all brothers… These groups [IS and al Qaeda] can only attract small numbers of people, people who are weak of faith and do not know their history.
Similar(52)
Biotechs went up, and have been weak of late.
In line with the whole financial sector, share prices for these banks have mostly been weak of late.
Moreover, the critical points of J are weak solutions of (1.1).
There are weak links, of course.
But those numbers are weak indicators of future performance.
Refinery activities are weak because of low demand for fuel.
Thus ({u_{n} }) are weak solutions of the problem (P).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com