• austere, censorious, dour, exacting, hard, hard and fast, harsh, inclement, iron-clad, religious, rigid, severe, sharp, smart, stern, strait, strict, stringent
• austerely, dourly, narrowly, rigidly, severely, sternly, strictly
• austerity, hardness, harshness, rigidity, rigidness, rigor, rigour, severity, stringency
• to be in leading-strings