grudging (adj.)

• apathetic
• backward
• balking
• balky
• covetous
• dilatory
• envious
• indifferent
• invidious
• jealous
• laggard
• loath
• mean
• mingy
• niggardly
• penurious
• perfunctory
• reluctant
• restive
• shabby
• slow
• sordid
• unenthusiastic