LINDA: The insurance inspector came. He said that they have evidence. That all these accidents in the last year - weren't - weren't - accident.
HAPPY: How can they tell that? That's a lie.
LINDA: It seems there's a woman ... (She takes a breath as)
BIFF (sharply but contained): What woman?
早速辞書で調べます。
・Infoplease Dictionary: showing restraint or calmness; controlled; poised: She was contained throughout the ordeal.
"contained" を見出しにしている辞書は上の辞書以外は余り無かった(上記以外の意味ではありますが)ので、 "contain" で調べると次ぎの説明があります。
・Collins English Dictionary: to keep (one's feelings, behaviour, etc) within bounds; restrain
・Macmillan Dictionary: to control or hide an emotion; I couldn’t contain my excitement any longer.; Laura barely contained her fury.
"contained" は感情を抑えた、自制した状態を示せるようです。