هذا شرح واحد من أهل اللغة, يعني خواجة :-)
"Un-like-ly"
"Like" is a word base.
"Un" is a prefix. Prefixes stand before the word base.
"Ly" is a suffix. Suffixes stand after the word base.
Both prefixes and suffixes are called affixes.
"Unhappy" - The affix(prefix) "un"
"Careless" - The affix(suffix) "less"
"Bound morpheme" is a morpheme that is bound to another/the other morpheme.
"Unlikely", "unhappy", "careless" are all bound morphemes.