There are several words that can be used in lieu of "hollow words" to describe statements that lack depth, sincerity, or meaning. One such word is "empty rhetoric," which refers to language that sounds impressive but fails to convey any substantive ideas or feelings. Another synonym is "hollow promises," which describes pledges that are made with no real intention of follow-through or action. "False platitudes" can also be used to describe insincere or trite statements that are meant to sound comforting or uplifting but ultimately ring hollow. Other synonyms might include "meaningless speeches," "vapid utterances," or "shallow assertions".