The synonym of 'Jocular' is -

Jocular (adjective):
English Meaning: humorous, enjoying making people laugh.
Bangla Meaning: রসিকতাপ্রিয়; রসিক।

Synonyms: Cheerful (আনন্দমুখর), Jolly (প্রফুল্ল), Jovial (উৎফুল্ল), Amusing (চিত্তাকর্ষক), Comic (হাস্যকর)। 
Antonyms: Serious (গুরুগম্ভীর), Humourless (রসহীন), Gloomy (বিষণ্ন), Depressed (হতাশ), Demoralized (অবদমিত)। 

Other Forms: 
Jocularly (adverb).
Jocularity (noun).

Example Sentence: 
1. She explained in a jocular fashion that I was the problem.
2. She sighed and turned her head to look behind her and gave him a jovial smile.

Source: Lecture