Definition of strict :
unappeasable, reliable, hard-line, unmitigated, usual, fixed, unpermissive, morose, veracious, abstract, tough, unforgiving, authentic, easy, orthodox, ramrod, utopian, hard, flinty, conceptual, inexorable, faithful, exigent, popular, specific, nonconformist, true, hardline, heavy-handed, theoretical, perfect, unyielding, cast-iron, unrelenting, deterministic, unerring, set, metaphysical, close, nonindulgent, stiff, invariable, tight, brassbound, full, central, hard-and-fast
precise (part of speech: adjective)
vigilant (part of speech: adjective)
diligent, watchful, alert, cautious, thorough, mindful, prepared, finical, responsible, guarded, scrupulous, conscientious, observant, fastidious, attentive, provident, particular, ready, regardful, sharp-eyed, prudent, fussy, thoughtful, careful, heedful, vigilant
severe (part of speech: adjective)
demanding, relentless, austere, fundamental, gruff, rigid, brusque, dry, uncompromising, piquant, curt, oppressive, correct, brisk, chilly, obdurate, icy, stern, bleak, meticulous, disciplined, cutting, short, stringent, hidebound, blunt, caustic, censorious, keen, cool, tart, exacting, basic, acute, severe, ascetic, acerbic, imperial, puritanical, astringent, precise, lean, rigorous, frosty, spare, Draconian, harsh, acrimonious, unbending, intense, prudish, obstinate, intolerant, critical, authoritarian, sharp, abrupt, strait-laced, stark, raw, Spartan, inflexible, crisp, grim, stiff-necked, dour
- Is your cousin so strict then? - "Bertha Garlan", Arthur Schnitzler.
- This is one of Peter Sadler's camps, and he has strict rules against strangers stoppin' in any of them. - "The Associate Hermits", Frank R. Stockton.
- Both have originated within the Asiatic continent, and in many respects a strict line cannot be drawn between them. - "The History of the European Fauna", R. F. Scharff.