rigorous (
http://definr.com/rigorous)
adj 1: rigidly accurate; allowing no deviation from a standard;
"rigorous application of the law"; "a strict
vegetarian" [syn:
strict]
2: demanding strict attention to rules and procedures;
"rigorous discipline"; "tight security"; "stringent safety
measures" [syn:
stringent,
tight]
3: (of circumstances; especially weather) causing suffering;
"brutal weather"; "northern winters can be cruel"; "a
cruel world"; "a harsh climate; "a rigorous climate";
"unkind winters" [syn:
brutal,
cruel,
harsh,
unkind]