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Not known or difficult to know

secret

adjective

not known about by many people

private

adjective

understood by only a few people, not by everyone

personal

adjective

private and not known or available to most people

strange

adjective

not familiar or known to you

unknown

adjective

if something is unknown, people do not know about it or do not know what it is

uncertain

adjective

not clearly known or understood

hidden

adjective

if something is hidden, most people do not know about it or understand it

mysterious

adjective

not recognized or known

anonymous

adjective

if someone is anonymous, no one knows their name

obscure

adjective

not known about, or not well known

hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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Open Dictionary

boots on the ground

a situation in which a country's armed forces are physically present in an area of conflict …

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