Verses with the word unfruitful in the New Testament (6 verses):

Matthew 13:22
He also that received seed among the thorns is he that heareth the word; and the care of this world, and the deceitfulness of riches, choke the word, and he becometh unfruitful.

Mark 4:19
And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in, choke the word, and it becometh unfruitful.

1 Corinthians 14:14
For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.

Ephesians 5:11
And have no fellowship with the unfruitful works of darkness, but rather reprove them.

Titus 3:14
And let our's also learn to maintain good works for necessary uses, that they be not unfruitful.

2 Peter 1:8
For if these things be in you, and abound, they make you that ye shall neither be barren nor unfruitful in the knowledge of our Lord Jesus Christ.