From length + -y.

lengthy (comparative lengthier, superlative lengthiest)

1. Having length; long and overextended, especially in time rather than dimension.

   a lengthy text

   a lengthy discussion

   a laborious and lengthy process

   She died last night after a lengthy illness.

   They received lengthy prison terms.

2. Speaking or writing at length; long-winded.
   • 1863, John Cumming, Driftwood, seaweed and fallen leaves, volume 1, page 92:

     If, in addition to being a lengthy preacher, he had also been a Rev. Mr. Mumbles or a Rev. Dr. Drone, the penance thus endured by his people would have been intolerably severe.

• lengthful
• lengthish
• lengthsome

• French: long, longuet
• German: lang, ausgedehnt, langdauernd, langwierig, ellenlang, langanhaltend
• Italian: lungo, esteso, lento
• Portuguese: extensível, extenso
• Russian: дли́тельный