It may not be tightened, but it may be untightened. ) tight = firmly closed un + tight = NOT firmly closed (loose) untight + en = the act of making NOT firmly closed (the act of making loose) (the act of loosening) untighten + able = capable of being made NOT firmly closed (capable of being made loose) (capable of being loosened) I believe your two sequences are correct. Sorry, I accidently put the second one first.
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Avangia.) tight = firmly closed ADJECTIVE /ADVERB
tight + en = the act of closing firmly VERB
tighten + able = capable of being closed firmly ADJECTIVE
un + tightenable = NOT capable of being closed firmly ADJECTIVE
tightly - ADVERB
b.) tight = firmly closed
un + tight = NOT firmly closed