The phrase "altogether unknown" is correct and usable in written English.
It can be used to describe something that is completely unfamiliar or not known at all.
Example: "The origins of the ancient artifact remain altogether unknown to historians."
Alternatives: "completely unknown" or "entirely unknown."
For we must not think that this system was altogether unknown to the people of Western Europe.
The most unusual thing about "Milosz's ABC's" is that many deal with people little remembered or altogether unknown, even in Poland.
Though there had been great collections in the area in the past, and several new ones have been formed in the last 15 years, at the time collectors were an altogether unknown species.
Whistling in the dark is an occupational hazard not altogether unknown to the British left". These two things came together to elevate him, in my estimation, above the overwhelming majority of academics of his status.
Their proximal existence could have been altogether unknown to me. S. Craig Watkins, a professor who studies the digital media behavior of young people in the department of Radio-Television-Film at the University of Texas at Austin, said that he and his family almost exclusively stream music now in their home and that he and his wife stored their old CDs in a seldom-used cabinet.
9 The stones of this substructure are not of a size such as we are acquainted with, 10 for the builders of this work, in struggling against the nature of the terrain and labouring to attain a height to match the rocky elevation, had to abandon all familiar methods and resort to practices which were strange and altogether unknown.
Coverage of child health reviews for children who emigrate out of Scotland altogether is unknown, but emigration is commoner among least deprived groups.
Fletcher, Vermont (population 737), was simply too small to suggest that its success resulted from anything more than remote location, good fortune, or the ways in which the virus skipped some communities altogether for unknown reasons (8 – 10 ).
This is a novel and not altogether welcome experience, unknown to me in younger years.
The idea indeed of citizens transforming themselves into aliens, by taking part against the state, to which they belong, is altogether of new-invention, unknown and inadmissible in law, and contrary to the nature of the social compact.
First, the reader may opt to ignore the unknown word altogether.
