adj. 25B6; adjective
rigorous attention to detail : METICULOUS, conscientious, punctilious, careful, diligent, attentive, scrupulous, painstaking, exact, precise, accurate, thorough, particular, strict, demanding, exacting; informal pernickety.
the rigorous enforcement of rules : STRICT, severe, stern, stringent, tough, harsh, rigid, relentless, unsparing, inflexible, draconian, intransigent, uncompromising, exacting.
rigorous yachting conditions : HARSH, severe, bad, bleak, extreme, inclement; unpleasant, disagreeable, foul, nasty, filthy; stormy, wild, tempestuous.
slapdash, lax, mild.