on one's good behavior

adjective

Roget 894: courteous, polite, civil, mannerly, urbane; well-behaved, well-mannered, well-bred, well-brought up; good-mannered, polished, civilized, cultivated; refined etc. (taste) 850; gentlemanlike etc. (fashion) 852^†; gallant; on one's good behavior.    fine spoken, fair spoken, soft-spoken; honey-mouthed, honey-tongued; oily, bland; obliging, conciliatory, complaisant, complacent; obsequious etc. 886.    ingratiating, winning; gentle, mild; good-humored, cordial, gracious, affable, familiar; neighborly.    diplomatic, tactful, politic; artful etc. 702.    ... show more

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