The phrase "a daunting combination of" is correct and usable in written English.
It can be used to describe a mix of elements that are intimidating or challenging.
Example: "The project presented a daunting combination of tight deadlines, complex requirements, and limited resources."
Alternatives: "an intimidating mix of" or "a challenging blend of".
It was a daunting combination of challenges that would have defeated many more experienced editors.
It is a human and a moral task, as much as an esthetic one, and it calls for a daunting combination of qualities.
The Steelers finished the season as the N.F.L.'s top-ranked defense with a daunting combination of allowing a league-low 74.7 rushing yards a game while punishing quarterbacks with a league-leading 55 sacks.
Workers just a few years younger than Mr. Walden have been thrust into a daunting combination of a temporarily feeble economy and the longer-term elimination of traditional middle-class jobs.
She credits a curriculum approach that uses what sounded like a daunting combination: whole language, guided reading and phonics techniques.
This is a daunting set of challenges, but combination therapies leveraging biomaterials and the immune system offer many features that could help address these hurdles.
Despite its interest, mapping epistasis in complex traits is a daunting task because of the great number of pair-wise combinations implicated and their small individual effects.
Now, I am confounded by a combination of the daunting size of the task, the uncertainties of changing technology (how long are CDs I create actually going to last), my fading memory (4 kids, a few parents, aunts, uncles and cousins seem to have markedly different memories of who, what, where and when), and my spineless inability to throw almost any image away.
The combination of authoritative summaries along with anecdotes from students themselves help lend substance to what otherwise might be a daunting litany of do's and don'ts about grad school.
