Upright, or straight and narrow; — said of the shape of the plants or their flower clusters.
Severe in discipline.
Irreflexive; if the described object is defined to be reflexive, that condition is overridden and replaced with irreflexive.
Tense; not relaxed.
Exact; accurate; precise; rigorously particular.
Governed or governing by exact rules; observing exact rules; severe; rigorous.
Rigidly interpreted; exactly limited; confined; restricted.
Strained; drawn close; tight.
That cannot be mollified.