Answer: strange

AnswerCrossword Clue
STRANGEUnaccountable
STRANGEAnomalous
STRANGEU.S. Open golf champ: 1988-89
STRANGEFey
STRANGEEldritch
STRANGEL. Smith's "... Fruit"
STRANGEO'Neill's "... Interlude"
STRANGECurtis of the P.G.A.
STRANGEHouston Open winner in 1980
STRANGEQuaint
STRANGEOff-center
STRANGEExtraordinary
STRANGEQuaint.
STRANGESingular.
STRANGEUnaccountable.
STRANGEWhat "truth is always."
STRANGENovel.
STRANGEUncommon.
STRANGE"Interlude" of O'Neill title.
STRANGEUnaccustomed.
STRANGEWord in a Heinlein title
strangeunusual; odd
strangeunusual (not usual) / an unfamiliar person or thing
strangeunfamiliar
STRANGEOff
STRANGEOddball
STRANGEOutre
STRANGE1967 Doors hit People Are ...
STRANGEForeign
STRANGEOutlandish
STRANGEOdd.
STRANGEFreaky
STRANGEGolfer who won the U.S. Open in 1988 and 1989
STRANGEEyebrow-raising
STRANGELike cases on "The X-Files"
STRANGEFunny
STRANGEExotic
STRANGEWay out
STRANGEWay-out
STRANGEUnfamiliar