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The phrase "a formidable and complex" is correct and usable in written English.
It can be used to describe something that is both impressive in its difficulty or strength and intricate in its nature or structure.
Example: "The project presented a formidable and complex challenge that required extensive planning and collaboration."
Alternatives: "a daunting and intricate" or "an impressive and complicated".
Exact(1)
Managing Britain's exit from the European Union is such a formidable and complex challenge that it could overwhelm politicians and civil servants for years, senior academics have warned.
Similar(55)
The strain faced by a ship on a whole constitutes probably the most formidable and complex of all structural engineering problems in two aspects: the determination of the loading, and the response of the structure.
What strikes you is that while these films are about tough guys, they are even more about formidable and complex women.
The challenges are formidable and complex, but with concerted action on many fronts, progress is possible.
Although there are many encouraging trends, the challenges are formidable and complex, and observers active in the field understand that their campaign will be long, with no assurance of victory.
The processing of auditory scenes is a formidable and multicomponent computational problem, requiring deconvolution of a complex, dynamic sound mixture and accurate perceptual representation of auditory objects embedded in the scene (Griffiths and Warren, 2002; Goll et al., 2010).
Nevertheless, they made a formidable, and happy, team.
The short-handed Bulls posed a formidable and physical test.
Frito-Lay had a formidable research complex near Dallas, where nearly 500 chemists, psychologists and technicians conducted research that cost up to $30 million a year, and the science corps focused intense amounts of resources on questions of crunch, mouth feel and aroma for each of these items.
Matthew Olsen, the director of the US National Counterterrorism Center, depicted Isis on Wednesday as a formidable adversary employing "complex and adaptive" military tactics, but which is nevertheless "vulnerable to coordinated and effective military action".
Everything was held precariously together by the person of the monarch, a formidable legal apparatus and a complex system of conciliar administration.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com