  This paper discusses the boundedness of the trilinear multiplier operator
$T_{m}(f_1,f_2,f_3)$, when the multiplier satisfies a certain degree of
smoothness but with no decaying condition and is $L^{q}$-integrable with an
admissible range of $q$. The boundedness is stated in the terms of
$\|m\|_{L^{q}}$. In particular, \begin{equation*}\|T_{m}\|_{L^2\times L^2\times
L^2\to L^{2/3}}\lesssim\|m\|_{L^{q}}^{q/3}.\end{equation*}
