The FTIR spectra of fluoroform trapped in argon and nitrogen matrixes are studied at T 10-30 K. The bands of E symmetry show the splitting effect in a nitrogen matrix, which is absent in an argon matrix. The effect is the most prominent in the case of the μ₄ CH bending vibration. It decreases slightly with increasing temperature. Both static and Car-Parrinello molecular dynamic simulations suggest that the degeneracy lifting is due to C_3v symmetry lowering caused by interactions between fluoroform and all neighbor N₂ matrix molecules.