Antonyms for Fourier Transform Infrared Spectroscopy (FTIR) can be words or phrases that are unrelated or are the opposite of it. These may include non-infrared spectrum, non-spectroscopic techniques, or simply non-spectral analysis methods. FTIR is a widely used analytical technique in chemistry, material science, and biotechnology that measures the absorption or transmission of infrared radiation by a sample. Antonyms for FTIR, therefore, may include methods like X-ray crystallography, mass spectrometry, or nuclear magnetic resonance spectroscopy, which use different principles and interact with matter differently. Other antonyms may include qualitative analysis, physical measurements, or visual inspections, which all differ widely from FTIR in terms of their capabilities and applications.