clandestine
B2CEFR level
55/100Rarity: uncommon
FormalRegister
General adjective
Kept secret, especially because illicit.
The pair held clandestine meetings in the back of the café.
Law adjective
Carried out secretly, as of unlawful entry concealed from border authorities.
He made a clandestine entry concealed in a lorry, evading immigration control altogether.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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