Her voice was doubtful.
( ( Her voice ) ( ( was doubtful ) . ) )
(ROOT (S (NP (PRP$ Her) (NN voice)) (VP (VBD was) (ADJP (JJ doubtful))) (. .)))
Her voice was ironclad and radiated confidence.
( ( Her voice ) ( ( was ( ( ( ironclad and ) radiated ) confidence ) ) . ) )
(ROOT (S (NP (PRP$ Her) (NN voice)) (VP (VBD was) (NP (ADJP (JJ ironclad) (CC and) (JJ radiated)) (NN confidence))) (. .)))