private

Strongest matches

confidential, exclusive, independent, individual, secret, separate, special

Strong matches

closet, inside, particular, privy

Weak matches

behind the scenes, clandestine, close to one's chest, discreet, hush-hush, hushed, nonpublic, not open, off the record, own, reserved, under one's hat, unofficial

Strongest matches

quiet, secluded, secret, separate

Strong match

solitary

Weak matches

concealed, discreet, removed, retired, sequestered, withdrawn

Strongest match

soldier

Strong matches

GI, infantry, sailor

Weak matches

enlisted person, first-class, private soldier, second-class