We report on the characterization of $\mathrm{L}{\mathrm{i}}_4\mathrm{M}{\mathrm{n}}_2\mathrm{T}{\mathrm{e}}_2{\mathrm{O}}_{11}$, a previously unstudied layered oxide that exhibits ferrimagnetic ordering below 30 K and an exceptionally large coercive field exceeding 9 T at 2 K. The crystal structure consists of alternating ${\mathrm{Mn}}^{3+}$ triangular layers and zigzag chains, creating two inequivalent magnetic sublattices. Magnetic measurements reveal net in-plane magnetization and pronounced anisotropy, with strong hysteresis and domain pinning behaviors. The magnetization direction is controlled by the field-cooling history and remains locked under applied fields up to 9 T. Out-of-plane measurements show negligible net magnetization but exhibit a distinct high-field kink, likely attributed to spin reorientation. Heat capacity data show a broad magnetic anomaly that shifts and weakens under field, consistent with antiferromagnetic-dominated interactions. These results establish $\mathrm{L}{\mathrm{i}}_4\mathrm{M}{\mathrm{n}}_2\mathrm{T}{\mathrm{e}}_2{\mathrm{O}}_{11}$ as a rare ultrahard ferrimagnet with strong anisotropy, offering a promising platform for low-dimensional spintronic and domain engineering applications.

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• Ferrimagnets
• Layered crystals