unannounced
SEASON OF TELEVISION SERIES
Stress (The Unit); 200th Hour; Non-Permissive Environment; Security (The Unit); Dedication (The Unit); SERE (The Unit); Eating the Young; Unannounced; Exposure (The Unit); Morale, Welfare and Recreation (The Unit); The Wall (The Unit); 200th hour; Morale, Welfare and Recreation (TV episode); True Believers (The Unit)
(adj.) = inesperado, imprevisto, sin previo aviso, sin avisar, sin ser anunciado de antemano
Ex: The arrival of the school doctor or dentist or of well-knwon personalities visiting the school normally occur unannounced.