ingratiating (adj.)

• abject
• adulatory
• beggarly
• bland
• bootlicking
• buttery
• cringing
• deferential
• disarming
• fawning
• flattering
• fulsome
• glib
• groveling
• hangdog
• insinuating
• mealymouthed
• obsequious
• oily
• parasitic
• prostrate
• saccharine
• servile
• silken
• silky
• slimy
• smarmy
• smooth
• smooth-spoken
• smooth-tongued
• smug
• soapy
• soft-spoken
• suave
• sugary
• sycophantic
• timeserving
• toadyish
• unctuous