unfit & unable
Words starting with pre - (prefix):precursorprejudgepreludepremedpremixprenatalprenuptialpresortpresumepreteenWords beginning with pre, (not a prefix):preachpreenpresspressure
encampedencloseencodeendorseentailensueensnareentrustenvelopeentwineentrapped
Archetypal, archeology
benefit benevolent beneficial
Some words that use the prefix 'un' are:unableunbelievableunconsciousundeniableunendingunfurledungainlyunholyunimaginableunjustunknownunlovedunmeritedunnoticedunownedunprovenunquietunrestunsinkableuntidyunusedunvariedunwantedunexplained (OK, so I cheated a little)unyieldingunzip
unbelievable, unusual, unnatural, uneven, unwarranted
Words that start with the prefix holy include:holystoneholydayholytide
unfit
No, "un-" is a prefix that is added to words to indicate a negation or reversal of the word's meaning. "Unbelievable" is a word itself, formed by adding the prefix "un-" to "believable."
Words with the prefix -im:immaterialimmatureimmobileimmortalimpartialimperfectimpossibleimpracticalimproperWords with the prefix -in:inaccurateinactiveincalculableincapableincapacitateinconceivableindescribableindiscriminateindivisibleineffectiveingrowninvisibleinvoluntary
Words with prefix un include unhappy, unsanitary, unwell, undone, uncompromising, unbelievable, unsettling, unassuming, unimaginative, unsaid... Many adjectives can be formed by adding the prefix un- to another adjective (that does not have a prefix already).
un is the prefix of familiar so there is no prefix for an already prefixed word
unfit & unable
Words that start with the prefix af:AfroAffairAfterAfghanAfoulAfraidAffordAforeAfootAffirm
Words starting with pre - (prefix):precursorprejudgepreludepremedpremixprenatalprenuptialpresortpresumepreteenWords beginning with pre, (not a prefix):preachpreenpresspressure
Some words that start with a short U sound are up, us, under, and umpire.