Rigorous

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Meticulous

Synonyms Meticulous, conscientious, diligent, ultra-careful, painstaking, precise, correct, studious, mathematical, perfectionist, particular, strict, fastidious, finicky, demanding, pedantic, pernickety, nice, laborious, punctilious, careful, attentive, scrupulous, exact, accurate, thorough, exhaustive, detailed, methodical, religious, fussy, hair-splitting, finical, exacting, nitpicking, persnickety, and overnice.

Strict

Synonyms Strict, stern, austere, tough, harsh, cruel, relentless, inflexible, despotic, intransigent, demanding, severe, stringent, spartan, hard, rigid, savage, unsparing, authoritarian, draconian, uncompromising, and exacting.

Harsh

Synonyms Harsh, bad, extreme, unpleasant, foul, filthy, blustery, wild, storm-tossed, heavy, raging, severe, bleak, inclement, disagreeable, nasty, stormy, squally, tempestuous, violent, heaving, and choppy.

Example Sentences

The training program is very rigorous.

They follow rigorous safety procedures always.

Her research requires rigorous analysis techniques.

The curriculum is rigorous and challenging.