The phrase "be still" implies a sense of quietness, calmness, and peace. There are various synonyms that can be used to express this sentiment, such as "remain calm," "hold steady," "serene," "quiet," "tranquil," "unruffled," "composed," "placid," "motionless," and "unperturbed." These words can be used in different contexts, such as in meditation, relaxation, or in a situation where someone needs to exhibit inner strength and composure. Using synonyms for "be still" can help individuals communicate effectively and accurately convey their message of peacefulness and stillness in different settings.