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Learner's definition of WEAK  
[also more weak; most weak]
: having little physical power or ability : not strong
: having little power or force
: likely to break or stop working properly : not able to handle weight, pressure, or strain
: having little power or influence
   b  : not able to make good decisions or deal with difficult situations
: lacking enough or the usual amount of an important ingredient
   b  : not powerful in action or effect
: not likely to persuade or convince people that something is true, real, correct, etc.
: not having enough skill or ability
: failing to produce the result that is wanted : not effective
: showing little confidence or enthusiasm
10  : having a value that is small or is not increasing : less valuable
   b  : in a poor financial condition
11  : dull or pale
12  : smaller than the usual size
13  grammar  : following the normal patterns by which the past tenses of verbs are usually formed : regular

a weak stomach

— see 1stomach

the spirit is willing but the flesh is weak

— see 1spirit

the weak

weak at/in the knees

: so nervous or powerfully affected that it is difficult for you to stand
weakfeeble,  and frail mean lacking strength.
weak is a general word that can describe either a temporary or permanent lack of strength.
feeble stresses the kind of very great weakness that often makes other people feel pity or sympathy.
frail is usually used to describe a very weak person who is easily injured especially because of illness or age.
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