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not strong; not strong enough to work, last, succeed, persuade or be effectiveIt's not surprising you feel weak if you haven't eaten properly for days.
The electromagnetic field strength becomes weaker as you move further away from high voltage cables.
He was a weak king surrounded by corrupt advisers.
Any evidence that exists to support the hypothesis is fairly weak.
He gave the weakest of excuses when asked why he was late.
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describes a drink that contains a lot of water compared to its other contents, so that it does not have a strong flavourI can't stand weak coffee/tea.
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specialized describes an acid, alkali or chemical base that does not produce many ions (= atoms with an electrical charge) when it is dissolved in water