Answer: sparely

AnswerCrossword Clue
SPARELYUngenerously
SPARELYIn an economical manner
SPARELYParsimoniously.
SPARELYLeanly.
SPARELYScantily.
sparelying over and above what is needed superfluous spare time
sparelySPARE, meagre (inadequate, also MEAGER)
sparelynot being used