Kind of sincere, earnest, like you might find in a kids' movie; homely, a little banal, or... it's on the tip of my tongue!
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1A dad joke?– user116295Commented Dec 30, 2015 at 19:47
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1Please supply an example of the type of joke you mean.– Matt E. ЭлленCommented Dec 30, 2015 at 19:48
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2Perhaps clean?– JimCommented Dec 30, 2015 at 19:52
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1How about G-rated?– DyingIsFunCommented Dec 30, 2015 at 19:54
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1How about wholesome?– WhatRoughBeastCommented Dec 30, 2015 at 21:50
3 Answers
Wholesome would seem to fit, with its' associations with G-rated family appropriateness.
If these two suggestions for family-friendly jokes are not be quite right, the synonyms may help.
larking Google source (informal Brit.) gerund or present participle: larking
enjoy oneself by behaving in a playful and mischievous way. "he's always joking and larking about in the office"
synonyms: fool about/around, play tricks, indulge in horseplay, make mischief, monkey about/around, footle about/around, clown about/around, have fun, cavort, caper, romp, frolic, skylark;
ribbing from Merriam-Webster (adjective)
marked by or expressive of mild or good-natured teasing "the lightly ribbing tone tipped me off that this wasn't a serious reprimand"
Synonyms of ribbing
bantering, chaffing, fooling, funning, jesting, joking, joshing, kidding, rallying, razzing, ribbing.
Another (ostentatious) option that occurs to me, after some hunting, is anodyne.
adjective: not likely to provoke dissent or offense; inoffensive, often deliberately so: anodyne New Age music | I attempted to keep the conversation as anodyne as possible.