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rigorous

rig·or·ous

rigorous

 
 
pronunciation:
rI g rs
part of speech: adjective
definition 1: showing strictness or sternness.
The soldiers were kept to a rigorous military regimen.
 
synonyms:
exact, exacting, harsh, severe, stern, strict, stringent
antonyms:
lax
similar words:
austere, demanding, dour, hard, rigid, rugged, tough, trying
definition 2: harsh or severe.
Life is precarious in the rigorous arctic climate.
synonyms:
hard, harsh, rough, severe, tough
antonyms:
mild
similar words:
dour, trying
definition 3: thoroughly accurate; precise.
The equipment must meet rigorous specifications.
synonyms:
accurate, exact, precise, rigid, strict
antonyms:
slapdash
similar words:
close, correct, demanding, exacting, mathematical
derivations: rigorously (adv.), rigorousness (n.)