locking up (noun) imprisonment: placing in forcible detention
Sinonime: adamantine,
callous,
compact, compacted, compressed,
concentrated, consolidated,
dense, firm, hardened, impenetrable, indurate, indurated, inflexible, iron,
packed, rigid, rocky,
set,
solid,
stiff, stony,
strong,
thick, tough, unyielding
Antonime: flexible,
malleable,
pliable, pliant, soft,
yielding