trifling

/ˈtrī-f(ə-)liŋ/

adjective

  1. lacking in significance or solid worth: such as

  2. frivolous

  3. trivial

trifling talk

verb

  1. to treat someone or something as unimportant

  2. to talk in a jesting or mocking manner or with intent to delude or mislead

  3. to handle something idly

trifle toy dally flirt coquet mean to deal with or act toward without serious purpose. trifle may imply playfulness, unconcern, indulgent contempt. toy implies acting without full attention or serious exertion of one's powers.

phrasal verb

  1. to treat or deal with (someone or something) in a way that shows a lack of proper respect or seriousness

You shouldn't trifle with their feelings.