Functional Axis: Fe/Ni/Se/Ti
Dominant Function: Fe
Cynthia is a charming and emotionally open young woman. She is described as having a sunny disposition and is quite talkative, but also willing to show her own vulnerabilities, even to stranger like Poirot. Cynthia is generally very polite to strangers and family alike and does her best to please her adoptive aunt, recognizing the dependency she has on her. Beneath this surface she harbors mixed feelings about her adoptive mother and intense feelings for Lawrence, whom she later marries.
Auxilliary Function: Ni
Cynthia is a very modern woman for her time and even has her own job, which was rather uncommon for young woman back than. She is also quite perceptive about others feelings, correctly asserting Poirots initial suspicion of her. She is quick to interprete others feelings and sticks to her conclusions, often ignoring other perspectives in favor of her insight, like when she is convinced Lawrence secretly hates, while he actually has a crush on her. Cynthia is drawn in by Lawrnece poetic musing, showing a more romantic and cerebral side to her. Her job as an apothecary also shows her scientifically inclined and open minded personality.
Tertiary Function: Se
Cynthia is very beautiful and knows about her charms. She enjoys nature, taking her dinner outside, touching the grass and has and going with the flow. She can also acts a bit reckless under stress, which causes her to become one of the prime suspects in the murderer of Emily Inglethorpe. Overall Cnythia is quite a grounded and modern young woman, easily adapting to changing social structure and is realistic about her work and financial dependency on Mrs Inglethorpe.
Inferior Function: Ti
Cynthia is mainly guided by her emotions and less focused on acting logically. Her strong feelings for Lawrence cloud her judgment on his true feelings for her and cause her to behauenen ways that being herself under suspicion. Still she is confident in her logic and won‘t let herself be questioned, being certain about her own conclusions. When asked about her work in the apotheary, she assures Poirot that she won‘t let herself being yelled at or commanded around, showing her independent mind and critical thinking, as she prepares to sort things out eye to eye in a fair discussion, rather than taking orders from above (Te opposing).