Silly describes something that can't be taken seriously. You might not mind telling silly jokes, but you don't want to be told a project you've worked hard at is silly.

Silly originally meant “happy,” which gives the sense of children's games or harmless jokes. Later, it came to mean “foolish”: silly ideas are looked down on because they're not very smart. Silly can also mean a state of foolishness brought on in a specific way. Your mother “worried herself silly” when you stayed out late, and promised to “slap you silly” when you got home.

Definitions of silly
  1. adjective
    ludicrous, foolish
    “a silly idea”
    synonyms: cockamamie, cockamamy, goofy, sappy, wacky, whacky, zany
    devoid of good sense or judgment
  2. adjective
    inspiring scornful pity
    “"how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"- Dashiell Hammett”
    synonyms: pathetic, ridiculous
    lacking dignity
  3. adjective
    lacking seriousness; given to frivolity
    silly giggles”
    synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded
    not serious in content or attitude or behavior
  4. adjective
    dazed from or as if from repeated blows
    “knocked silly by the impact”
    synonyms: punch-drunk, slaphappy
    mentally confused; unable to think with clarity or act intelligently
  5. noun
    a word used for misbehaving children
    “don't be a silly
    see moresee less
    type of:
    child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster
    a young person of either sex
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