Meaning of “secure” - Learner’s Dictionary

secure

adjective uk us /sɪˈkjʊər/
NOT FAIL

B2 not likely to fail or be lost:

a secure investment/job
SAFE

B2 safe from danger:

I don't feel that the house is secure.
CONFIDENT

B2 confident about yourself and the situation that you are in:

I need to feel secure in a relationship.
FIXED

firmly fastened and not likely to fall or break:

Check that all windows and doors are secure.
→ Opposite insecure

(Definition of “secure adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)