Antonyms for the phrase "was in keeping" could include "was out of sync", "was off-kilter", or "was discordant". These terms imply a lack of harmony or compatibility, suggesting that something was not aligned with its surrounding environment or expectations. Alternatively, an antonym for "was in keeping" could be a phrase like "stood out", "was distinct", or "was unique". These terms suggest that something was noticeable or exceptional, perhaps because it departed from the norm or challenged expectations in some way. Ultimately, the choice of antonym depends on the particular context and usage of the phrase "was in keeping".