忠実

Etymology 1
From compound.

Adjective

 * 1) faithful, loyal, devoted

Noun

 * 1) faithfulness, loyalty, devotedness

Etymology 2
Probably an alteration of +.

Adjective

 * 1) faithful, loyal, devoted
 * 2) hardworking, painstaking, diligent
 * 3) healthy, fit

Noun

 * 1) faithfulness, loyalty, devotedness
 * 2) hardworkingness, painstakingness, diligence
 * 3) healthiness, fitness

Proper noun