appropriate, proper, suitable, becoming, befitting, fit, expedient

to be proper, to suit, to apply

which is according to the situation, peculiar

relation, accordance, relevance, consistency, proportion, suitability, fitness, expediency, propriety, analogy, comparison

to bear relation (to), to be proportionate (to), to be suitable, or adapted (to), to correspond, to accord (with)

Where appropriate

improper, inappropriate, unsuitable, unbecoming, indecorous, unfit

improper, unbecoming, inappropriate