Entry 1 sense Webster, 1913 Obstructionist · Ob·struc·tion·ist · IPA /əbˈstɹʌk.ʃənˌɪst/ 01 n. One who deliberately hinders progress; one who obstructs business, as in a legislative body. 1. One who deliberately hinders progress; one who obstructs business, as in a legislative body.[Recent]