The word "most sudden" is correct and usable in written English.
You can use it to describe something that happened abruptly or suddenly, or to express an unexpected event. For example: We were surprised by the most sudden downpour of rain.
The darkness enveloping their souls prevents most sudden movement.
The "charity tax" retreat was the most sudden of this week's about-turns.
But this window of opportunity was the most sudden and cruel of mirages.
And the most sudden, engulfing changes, those episodes that make the stage and hearts quake.
Their rehabilitation in almost every quarter must rank as the most sudden, surprising and complete in the history of brand management.
As the champagne glasses clinked and the cameras flashed, an outburst of racial abuse scythed through the party atmosphere at the Baftas in the most sudden and shocking manner.
GPs were asked to fill in two registration forms: one for the most recent sudden and totally unexpected death case in their GP practice; and one for the most recent non-sudden or expected death case in their GP practice.
All entities share similar clinical presentations, most often sudden severe thoracic or abdominal pain, as the initial presentation.
Most often, sudden unexpected death due to natural causes results from previously unknown cardiovascular diseases though extra cardiac causes should not be ruled out [ 1, 2].
All of a sudden, most of the poets down here became proletarian poets and most of the novelists became proletarian novelists and most of the painters became proletarian painters.
In most cases, only "sudden or accidental" discharges of water are covered in claims.
