New Revised Standard Version
Saul did not say anything that day; for he thought, “Something has befallen him; he is not clean, surely he is not clean.”

Contemporary English Version
Saul didn't say anything that day, because he was thinking, "Something must have happened to make David unfit to be at the Festival. Yes, something must have happened."

New American Bible
Saul, however, said nothing that day, for he thought, “He must have become unclean by accident.”

Douay-Rheims Bible
And Saul said nothing that day, for he thought it might have happened to him, that he was not clean, nor purified.

And Saul said nothing that day, for he thought it might have happened to him, that he was not clean, nor purified.

he is not clean

Leviticus 7:21 And he that hath touched the uncleanness of man, or of beast, or of any thing that can defile, and shall eat of such kind of flesh: shall be cut off from his people.

Leviticus 11:24,27,31,40 And whosoever shall touch the carcasses of them, shall be defiled: and shall be unclean until the evening: . . .

Leviticus 15:5,16,17,19-21 If any man touch his bed, he shall wash his clothes and being washed with water, he shall be unclean until the evening. . . .

Numbers 19:16 If any man in the field touch the corpse of a man that was slain, or that died of himself, or his bone, or his grave, he shall be unclean seven days.