New Living Translation
For if I pray in tongues, my spirit is praying, but I don’t understand what I am saying.

American Standard Version
For if I pray in a tongue, my spirit prayeth, but my understanding is unfruitful.

Berean Study Bible
For if I pray in a tongue, my spirit prays, but my mind is unfruitful.

Douay-Rheims Bible
For if I pray in a tongue, my spirit prayeth, but my understanding is without fruit.

English Revised Version
For if I pray in a tongue, my spirit prayeth, but my understanding is unfruitful.

King James Bible
For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.

World English Bible
For if I pray in another language, my spirit prays, but my understanding is unfruitful.

Young's Literal Translation
for if I pray in an unknown tongue, my spirit doth pray, and my understanding is unfruitful.

1 Corinthians 14:14 Additional Translations ...