security risk

person who, because of his political beliefs, personal habits, etc may endanger the security of the state, eg by revealing secrets to an enemy （威胁国家安全的）危险人物: She's a poor/good security risk. 她是个不太[十分]危险的人.

secretive, secretively, secretiveness, secretly, sect, sectarian, sectarianism, section, sectional, sectionalism, sector, secular, secularism, secularist, secularize, secularise, secure, securely, securities, security, security guard, sedan, sedate, sedately, sedateness, sedation, sedative, sedentary, sedge, sedgy, sediment, sediment-covered, sedimentary, sedimentation, sedition, seditious, seditiously, seduce, seducer, seduction, seductive,