Answer: flat

AnswerCrossword Clue
FLATPunctured tire
FLATOut of tune
FLATTurnpike concern
FLATKey to the left
FLATLike plains
FLATDriving problem
FLATIn need of tuning
FLATSharp relative
FLATBlack key, maybe
FLATBritish apartment
FLATLike stale cola
FLATNo longer fizzy
FLATTwo-dimensional, essentially
FLATPitched too low
FLATMotorist's headache
FLATIt makes a note lower
FLATJohn Steinbeck's "Tortilla ..."
FLATLike a pancake
FLATUnspirited?
FLATSharp opposite
flatsomething flat
FLATBallet slipper, e.g.
FLATFizzless
FLATLacking fizz
FLATMusical symbol
FLATTrip delayer
FLATLondon apartment
FLATPuncture consequence
FLATStale
FLATApartment
FLATLacking in depth
FLATAirless tire
FLATFormerly fizzy
FLATCause for a jack
FLATIn need of air, possibly
FLATLike Florida's landscape
FLATLevel
FLATReason to pull over
FLATLacking pizazz
FLATNote dropper