all, each, every, and both (and maybe some others with the same sort of inclusive meaning) are all less than optimal as subjects of a negated verb.

What does less than optimal mean?
Contributing Member1,620
Hi,

all, each, every, and both (and maybe some others with the same sort of inclusive meaning) are all less than optimal as subjects of a negated verb.

What does less than optimal mean?

Less than the best possible in the situation.

Best wishes, Clive
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