Playful means full of fun and lightness. Not serious, and not meaning any harm by it.
It describes people, animals and tone equally, so a playful kitten, a playful remark and a playful design are all standard. What the word guarantees is the absence of malice, which is why a playful insult is safe and the same words said flatly are not. The adverb playfully often accompanies a verb like nudged or teased. Its neighbours are mischievous, which carries slightly more risk, and frivolous, which is a criticism.
1adjectiveplayfulLively and full of fun, with no serious intent.
“He gave her a playful shove.”
Middle English
pleiful
English, today
playful
From Middle English pleiful, equivalent to play + ful.
Etymology from Wiktionary, CC BY-SA