καίτοιkaítoi

and yet, although: Acts 14:17; with participle, Hebrews 4:3.

Greek (New Testament) · G2543

Same root

καίkaí · G2532and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
τοίtoí · G5104an enclitic particle of asseveration by way of contrast; in sooth
καίτοιγεkaítoige · G2544and yet indeed, i.e. although really

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.