ob·struc·tion·ist \-_nə̇st\noun (-s) Usage:often attributive : one that hinders progress : one that deliberately and often by indirect or delaying tactics obstructs business (as in a legislative body) • ob·struc·tion·is·tic\ ̷ ̷| ̷ ̷ ̷ ̷|nistik\adjective