Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mōlīmen, ĭnis, n. [molior], a great exertion, effort, endeavor, attempt, undertaking (mostly poet., not in Cic.): ventus Trudit agens magnam magno molimine navem, Lucr. 4, 902: revellere Annosam pinum magno molimine, Ov. M. 12, 357: quanto cum fastu, quanto molimine circum Spectemus vacuam Romanis vatibus aedem, Hor. Ep. 2, 2, 93: sceleris, Ov. M. 6, 473: res, suo ipsa molimine gravis, Liv. 2, 56: rerum, Ov. P. 1, 2, 75: molimine vasto tabularia, id. M. 15, 809.