Verses with the word slothful in the New Testament (3 verses):

Matthew 25:26
His lord answered and said unto him, Thou wicked and slothful servant, thou knewest that I reap where I sowed not, and gather where I have not strawed:

Romans 12:11
Not slothful in business; fervent in spirit; serving the Lord;

Hebrews 6:12
That ye be not slothful, but followers of them who through faith and patience inherit the promises.