that useth milk The meaning is "who feeds on milk."

unskilful "Inexperienced."

for he is a babe This is a frequent metaphor in St Paul, who also contrasts "babes" (nçpioi) with the mature (teleioi), Galatians 4:3; 1 Corinthians 2:6; Ephesians 4:13-14. We are only to be "babes" in wickedness (1 Corinthians 14:20).

the word of righteousness i.e. the Scriptures, and especially the Gospel (see 2 Timothy 3:16; Romans 1:17, "thereinis the righteousness of God revealed").

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