clandestine
UK[klænˈdestɪn]US[klænˈdestɪn]
adj
kept secret or done secretively, especially because illicit.
Etymology
the word 'clandestine' entered english in the mid-16th century from the latin adjective 'clandestinus', meaning 'secret, hidden'. this latin term is derived from 'clam', meaning 'secretly', which is an adverb related to the verb 'celare', 'to hide'. the semantic core has remained remarkably stable from its latin origin, directly conveying the sense of actions performed in secrecy, often with a connotation of being concealed because they are improper or forbidden. its journey into english reflects a direct borrowing of a specialized legal and descriptive term to fill a precise niche in the lexicon of concealment.
Analysis
this word is a simplex loanword from latin and is not productively segmented using english spelling substrings.
Examples
they held a clandestine meeting in a secluded warehouse.
the spy was involved in clandestine operations behind enemy lines.
the group's clandestine activities were eventually uncovered by the authorities.