Many commentators object to use of sense 2 in writing; it appears to be limited chiefly to spoken English. Sense 1 is literary but is no longer in common use.
Many handbooks advise avoiding the adverb plenty in writing; "use very, quite, or a more precise word," they advise. Actually plenty is often a more precise word than its recommended replacements; very, fully, or quite will not work as well in these typical quotations.
It is not used in more formal writing.
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