strict
Strained; drawn close; tight.
Tense; not relaxed.
Exact; accurate; precise; rigorously particular.
Governed or governing by exact rules; observing exact rules; severe; rigorous.
(botany) Upright, or straight and narrow; — said of the shape of the plants or their flower clusters.
Severe in discipline.
(order theory) Irreflexive; ''if the described object is defined to be reflexive, that condition is overridden and replaced with irreflexive.