There are multiple synonyms that can be used in place of the phrase "bent knees." Some of the most common synonyms include "flexed knees," "curved knees," and "crouched knees." These synonyms can be used interchangeably in different contexts, depending on the situation. Other synonyms include "kneeling," "squatting," and "hunched over." These synonyms can convey a more specific image of the posture, depending on the context. "Kneeling" implies a more formal or religious posture, while "squatting" can imply a more casual or relaxed posture. "Hunched over" suggests a posture that is forward-leaning, while "bent knees" can simply suggest a position where the knees are not fully extended.