WordNet sense 1 (free from danger or risk):

secure

WordNet sense 2 (afflicted with or characteristic of mental derangement):

insane

WordNet sense 3 (holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill):

qualified

WordNet sense 4 (listed or recorded officially):

registered

WordNet sense 5 (capable of being guaranteed or certified):

certifiable