The word "tergiversant" is primarily used to describe someone who is unreliable, untruthful, or who frequently changes their opinions or beliefs. Some synonyms for this word include "traitorous," "fickle," "inconstant," "capricious," "deceitful," "treacherous," "duplicitous," "disloyal," "equivocating," and "shiftless." Each of these words conveys the idea of someone who cannot be trusted, who lacks steadfastness or consistency, or who is willing to betray others for their own gain. A tergiversant person is one who is notoriously difficult to pin down or hold accountable, making them a challenging personality to work with or rely on.