Instead of "slow," you can use words like "lethargic," "sluggish," "unhurried," or "gradual." Each of these synonyms conveys a sense of reduced speed or pace, though they may carry slightly different connotations. Depending on the context, you might also consider terms like "lagging" or "delayed."
a or an
you can use or , otherwise, or rather than.
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Like
athletics
spectacular
hard
Forefather?
peter
demonstrate, employ, illuminate,
You can use: manage and succeed.
Lumber or timber.