rigorous
1. [ adjective ] rigidly accurate; allowing no deviation from a standard
Synonyms: strict
Examples:

"rigorous application of the law" "a strict vegetarian"

Related terms: exact
2. [ adjective ] demanding strict attention to rules and procedures
Synonyms: tight stringent
Examples:

"rigorous discipline" "tight security" "stringent safety measures"

Related terms: demanding
3. [ adjective ] (of circumstances; especially weather) causing suffering
Synonyms: cruel harsh unkind brutal
Examples:

"brutal weather" "northern winters can be cruel" "a cruel world" "a harsh climate "a rigorous climate" "unkind winters"

Related terms: hard
Similar spelling:   rigorously