Responsible
Responsible adjective - Being the one who must meet an obligation or suffer the consequences for failing to do so.
Silly is an antonym for responsible.
Silly
Both words in one sentence
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The father even expresses his disbelief that "silly Billy Gates", whom he tutored in calculus, is partly responsible for that.
Source: Fish Out of Temporal Water -
Fantasy Zone is a weird and silly Cute 'em Up that involves a sentient space ship called Opa-Opa who has to stop the planet Menon from stealing other planet's money to build a giant army and find out who is responsible by shooting cute, bizarre looking enemies.
Source: Sudden Downer Ending - Would be an aversion (letting the husband be responsible for once) if she hadn't spent the money on a dress, but, really, who could blame the silly little thing for something like that, she just can't help herself.
Cite this Source
Silly and Responsible. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/responsible/silly
Responsible & Silly. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/responsible/silly>.
Silly or Responsible. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/responsible/silly.
Google Ngram Viewer shows how "responsible" and "silly" have occurred on timeline