Stringent
Strict; restrictive
Strife
Bitter conflict; discord; clash
Stymie
To thwart; to get in the way of; to hinder
Subjugate
To subdue and dominate; to enslave
Sublime
Awesome; extremely exalted; majestic
Subordinate
Lower in importance, position, or rank
Substantive
Having substance; real; essential; solid
Subversive
Corrupting; insurgent; overthrowing
Succinct
Brief and to the point; concise
Succumb
To yield it submit; to die
Supercilious
Haughty; patronizing
Superficial
On the surface only; shallow; not thorough
Surfeit
Excess; an excessive amount; over-indulgence in eating or drinking
Surreptitious
Sneaky; secret
Surrogate
Substitute
Sycophant
One who sucks up to others