a.
1.
Rigid, unbending, unyielding, inflexible, stark, subrigid.
2.
Firm, tenacious, thick, inspissated.
3.
Stubborn, obstinate, pertinacious, tenacious, strong.
4.
Rigorous, severe, strict, strait-laced, stringent, peremptory, absolute, positive, austere, dogmatic, uncompromising, inexorable.
5.
Formal, constrained, ceremonious, punctilious, prim, starch, stately, chilling, frigid, in buckram.
6.
Inelegant, cramped, harsh, crude, graceless, abrupt.
7.
Strong, fresh.