secure - verb

• get by special effort
• cause to be firmly attached
• assure payment of
• make certain of
• fill or close tightly with or as if with a plug
• furnish with battens

secure - adjective

• free from fear or doubt; easy in mind
• free from danger or risk
• not likely to fail or give way
• immune to attack; incapable of being tampered with
• financially sound

secure - thesaurus

assure   batten   dependable   ensure   fasten   fix   good   guarantee   impregnable   insure   inviolable   plug   procure   safe   strong   unafraid   unassailable   unattackable   untroubled