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The definition of secure

Synonyms:	fast, get, score (slang), reliable, safe, obtain, acquire, land (informal), gain, come by, procure, attach, stick, fix, bind, pin, lash, glue, fasten, rivet, guarantee, insure, ensure, assure, protect, shield, sheltered, immune, unassailable, impregnable, firm, fixed, tight, stable, steady, fortify, dependable, immovable, definite, solid, absolute, conclusive, confident, sure, easy, certain, assured, reassure
Antonyms:	lose, detach, endanger, insecure, uneasy

From Collins