"securest" in the adjective sense
1. secure, unafraid, untroubled
free from fear or doubt easy in mind
"he was secure that nothing will be held against him"
2. secure
free from danger or risk
"secure from harm"
"his fortune was secure"
"made a secure place for himself in his field"
3. secure
not likely to fail or give way
"the lock was secure"
"a secure foundation"
"a secure hold on her wrist"
4. impregnable, inviolable, secure, strong, unassailable, unattackable
immune to attack incapable of being tampered with
"an impregnable fortress"
"fortifications that made the frontier inviolable"
"a secure telephone connection"
5. dependable, good, safe, secure
financially safe
"a good investment"
"a secure investment"
Source: WordNet® (An amazing lexical database of English)
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