secure
verb
get by special effort
“He procured extra cigarettes even though they were rationed”
Synonymsprocurecause to be firmly attached
“fasten the lock onto the door”
“she fixed her gaze on the man”
assure payment of
make certain of
“This nest egg will ensure a nice retirement for us”
“Preparation will guarantee success!”
fill or close tightly with or as if with a plug
“plug the hole”
“stop up the leak”
furnish with battens
“batten ships”
adjective
free from fear or doubt; easy in mind
“he was secure that nothing will be held against him”
Oppositesinsecurefree from danger or risk
“secure from harm”
“his fortune was secure”
Oppositesinsecurenot likely to fail or give way
“the lock was secure”
“a secure foundation”
Oppositesinsecureimmune to attack; incapable of being tampered with
“an impregnable fortress”
“fortifications that made the frontier inviolable”
financially safe
“a good investment”
“a secure investment”
Source: WordNet 3.1, Princeton University