The word "truanciest" refers to someone who is consistently absent or doesn't show up for school or work. Some synonyms that can be used to replace this word include "absentee," "dropout," "non-attender," "skiver," "truant," and "unreliable." Each of these words carries a similar meaning that highlights an individual's lack of attendance or commitment to their responsibilities. While these words may have slightly different nuances, they can all be used interchangeably with "truanciest." It is important to note, however, that these words should not be used to label individuals without understanding the context behind their absences or behavior.