прил. unsusceptible, insusceptible (на to), proof (against); (здрав, издръжлив) inflexible, tenacious; (упорит) unmanageable, unamenable, uncompliant, unyielding, stubborn; unpliant, unpliable; intractable; ~ на внушение insuggestible, impervious to suggestion; ~ на дисциплина refractory; ~ на ласкателства superior to flattery; ~ на лечение insusceptible to medical treatment; ~ на обучение unteachable; той е ~ човек he is not susceptible/receptive to training etc.