correct for the occasion or purpose

suitable

of the side of the body etc that is towards the east when the front is towards the north; having conservative opinions; (of behaviour etc) morally good, legal, just; (of facts, reasons, time etc) correct, true

fair, just

according to law and justice

legitimate

fit, right (for the person, purpose or occasion)

appropriate, acceptable

(of a machine, set of instructions etc) simple and pleasant to use

appropriate, acceptable