Cessation, commence, deter, hamper, obstruction, preclude, procrastinate, scuttle, subside, thwart

Obstruction

Something that blocks ot gets in the way; an obstacle

Cessation

A bringing or coming to an end; a halt

Commence

To begin

Procrastinate

To delay; to put off doing something

Preclude

To make impossible or unlikely; to prevent

Hamper

To prevent from moving freely or making progress; to limit

Thwart

To prevent from taking place; frustrate; block.

Deter

To prevent or discourage from acting, by means of fear or doubt.

Scuttle

To run or move with short, hurried movements; to scurry

Subside

To sink to a lower or more normal level or to become less active or intense