Snivel (verb)

1. To cry or whine with sniffling.
2. To complain or express dissatisfaction in a whiney or tearful manner.

Origin:

From snivel (to run at the nose) + -er.

Examples:

1. The child was sniveling because he didn't get the toy he wanted.
2. The employee was sniveling about the workload.
3. The sniveling dog was making a mess of the carpet.
4. The sniveling customer was demanding a refund.
5. The sniveling student was complaining about the test.