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The phrase "a number of tricky" is correct and usable in written English.
It can be used when referring to several challenging or difficult items, situations, or tasks.
Example: "There are a number of tricky questions on the exam that require careful thought."
Alternatives: "several challenging" or "a variety of difficult".
Exact(12)
This is a starting point, but even for English there are a number of tricky cases.
We think it's been worthwhile but we've also involved negotiating a number of tricky dilemmas.
Lately I've been pondering and working on a number of tricky questions about implementing polyamory.
But the notion of prosecuting a corporation raises a number of tricky questions.
It turns on a number of tricky doctrinal issues like value for money and the integrity of public-sector accounting.
For the most part, however, these sites are earnest efforts at political activism and, because of that, they raise a number of tricky issues.
Similar(48)
But Asia also faces a number of peculiarly tricky problems.
By global bouldering standards, Rat Rock ain't much, but it is the indisputable hub of outdoor climbing activity in the city, with a surprising number of tricky bouldering problems on its north and east sides, and a revolving cast of characters who congregate there to take them on.
Furthermore, modifying the gene expression of a number of genes is tricky, and a perfect flux model should be available in order to avoid unintended effects.
Internet radio licenses open a number of interesting, if legally tricky, possibilities like this.
India's food delivery market had been a juicy target for venture capital investors for a number of years, but the tricky economics of the business have proven costly for several of them.
More suggestions(16)
a number of troublesome
a number of awkward
a number of sensitive
a number of tough
a number of cumbersome
a number of problematic
a number of delicate
a number of sticky
a number of complex
a number of complicated
a number of confusing
a number of convoluted
a number of thorny
a number of tricks
a number of challenging
a couple of tricky
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com