Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ălĭquantisper, adv. temp. [aliquantus-per; analog. to paulisper], for a moderate period of time (neither too long nor too short), for a while, for a time, for some time (ante-class. and post-Aug.): concedere aliquantisper hinc mihi intro libet, * Plaut. Ps. 1, 5, 158: Quor non ludo hunc aliquantisper? Ter. Ad. 4, 5, 5: concedas aliquo ab ore eorum aliquantisper, id. Heaut. 3, 3, 11: si illi egestate aliquantisper jacti forent, Caecil. ap. Non. 511, 27; Flor. 2, 18, 14: sed ille simulato timore diu continuit se, et insultare Parthos aliquantisper passus est, Just. 42, 4, 8; so id. 1, 8, 3.