Formal/Academic:
* The politician's actions were antithetical to his campaign promises, leaving many voters disillusioned.
* The study's findings were antithetical to the prevailing scientific consensus, sparking a heated debate within the field.
Informal/Descriptive:
* Her love for adventure was antithetical to her brother's desire for a quiet, comfortable life.
* The sleek, modern architecture of the new building was antithetical to the quaint, historic charm of the neighborhood.
Figurative:
* The artist's use of bright colors was antithetical to the somber, introspective nature of the subject matter.
* His ambition was antithetical to his laziness, leading to a perpetual state of internal conflict.
Key takeaway: "Antithetical" implies a strong opposition or contrast between two things. It suggests a fundamental incompatibility or an inherent contradiction.