One of the passages where the word "repent" IS used, is in Acts 3, where Peter is speaking to "ye men of Israel"... note what he says:
Acts 3 -
12 And when Peter saw it, he answered unto the people,
Ye men of Israel, why marvel ye at this? or why look ye so earnestly on us, as though by our own power or holiness we had made this man to walk?
13
The God of Abraham, and of Isaac, and of Jacob, the God of our fathers, hath glorified his Son [/Servant] Jesus;
whom ye delivered up, and denied him in the presence of Pilate, when he was determined to let him go.
14
But ye denied the Holy One and the Just, and desired a murderer to be granted unto you;
15
And killed the Prince of life, whom God hath raised from the dead; whereof we are witnesses.
16 And his name through faith in his name hath made this man strong, whom ye see and know: yea, the faith which is by him hath given him this perfect soundness in the presence of you all.
17
And now, brethren [his Jewish brethren, that is],
I wot that through ignorance ye did it, as did also your rulers.
18 But those things,
which God before had shewed by the mouth of all his prophets, that Christ should suffer, he hath so fulfilled.
19
Repent ye therefore,
and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord.
Here, Peter is telling them to "
metanoēsate" about the Person of Jesus Christ.