Gerund used as an uncountable noun referring to the act of obstruction.
The obstructing of the investigation resulted in additional charges.
L'obstruction de l'enquête a entraîné des accusations supplémentaires.
obstructinggerund / present participle Used attributively to describe something that causes obstruction.
The obstructing debris made the mountain trail impassable.
Les débris obstruants rendaient le sentier de montagne impraticable.
obstructifPlus soutenu; se rencontre surtout dans les contextes techniques ou médicaux.