secure /sɪˈkjʊər/ adjective
NOT FAIL › not likely to fail or be lost: a secure investment/job
SAFE › safe from danger: I don't feel that the house is secure.
CONFIDENT › 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