What is another word for "observant"?

Roget's Thesaurus (1911) lists these synonyms for "observant": abide, acknowledge, acknowledgment, acquiescence, acquit, acquittal, acquittance, act, adhere, adhesion, and, carry, cling, compliance, comply, concurrence, country, dial, discharge, engagement, exact, execute, execution, faith, faithful, fidelity, friend, fulfill, fulfillment, good, honorable, into, keep, literal, loyal, make, meet, needle, obedience, obligation.