There are various synonyms for the phrase "writings on the wall" which refers to an ominous signs indicating an impending disaster or warning signal. Other words that can be used to express the same idea include "portents," "forewarnings," "omens," "premonitions," "signals," or "indications." "Harbingers" is another term that conveys a similar sense of foreboding. These words all suggest a sense of warning or unease, often suggesting that something terrible might be about to happen. Whether it's a feeling of dread or a sense of impending danger, such phrases can be a useful way to express anxiety or fear about the future.