Definitions: (1) sincere and frank; honest and forthright; (2) real; true; authentic; not artificial; not counterfeit <a genuine manuscript>

Synonyms: (fair) dinkum, natural, unadulterated, unaffected, veritable

• The essence of Hinduism is the same essence of all true religions: Bhakti or pure love for God and genuine compassion for all beings. — Radhanath Swami [born Richard Slavin] (1950-) American Gaudiya Vaishnava guru
• The belief that all genuine education comes about through experience does not mean that all experiences are genuinely or equally educative. — John Dewey (1859–1952) American philosopher & psychologist

Comment: When, on the one hand, one seems genuine and honest, but on the other hand, has selfish motives, their true purpose cannot really be known until time clarifies it. However you may be able to see through their facade from the outset. If not, wait patiently, eventually the individual will show themself. Remember the old saying: “Actions speak louder than words.”
     Sometimes people say they are motivated by a set of positive qualities and yet are taking steps and actions going against the very qualities they profess to hold in such high regard.