There are several synonyms for the term "shy thing," each with their own subtle nuances of meaning. One such synonym is "timid creature," which conveys a sense of vulnerability and fragility in the subject. "Bashful being" is another option, which implies a reluctance to engage or interact with others. "Introverted individual" may be used to describe someone who is naturally reserved and introspective, and "reserved soul" suggests someone who may be quiet or aloof, but not necessarily lacking self-confidence or assertiveness. Finally, "withdrawn person" connotes a certain degree of isolation or detachment from others. All of these synonyms offer different shades of meaning to describe someone who may be reticent or hesitant in social situations.