Answer: tightest

AnswerCrossword Clue
TIGHTESTLeast generous
TIGHTESTMost miserly
TIGHTESTBest, as friends
tighteststingy
tightestscarce
tightestfirm; rigid
tightestTIGHT, taut (fully stretched)
tightestfirmly fixed in place
tightestfitting closely
tighteststretched so as to be tense