free-minded (adjective) happy-go-lucky: blithely unconcerned
Sinonime: behind closed doors, behind someone's back, by stealth, clandestinely, confidentially, covertly, furtively, hush-hush, in camera, in confidence, in holes and corners, in secret, in strict confidence, insidiously, intimately, obscurely, on the QT, on the quiet, on the sly,
personally, privately, privily,
quietly, slyly, stealthily, sub rosa, surreptitiously, under the table, underhandedly, unobserved
Antonime: openly, publicly