Safe
Shielded
Synonyms: Protected from harm/danger, sheltered, defended, safe and sound, all right, shielded, guarded, secure, and out of harm's way.
Secure
Synonyms: Secure, risk-free, riskless, unassailable, fortress-like, innocuous, non-poisonous, benign, mild, sound, low-risk, impregnable, invulnerable, harmless, non-toxic, non-irritant, and wholesome.
Cautious
Synonyms: Cautious, prudent, attentive, unadventurous, unenterprising, circumspect, chary, timid, conservative, and leery.
Unharmed
Synonyms: Unharmed, alive and well, unhurt, unscathed, undamaged, out of the wood(s), all right, well, uninjured, in one piece, out of danger, and OK.
Strongbox
Synonyms: Strongbox, safe-deposit box, casket, cash box, depository, strongroom, safety-deposit box, coffer, money chest, repository, locker, and vault.
Example Sentences
Safety should always come first.
Stay safe during bad weather.
Keep your passwords safe, always.
Wear safety gear when necessary.