Basically the only time you'll see 愉しい is if your friend is typing on his cell phone and the "auto-complete" feature selects this one instead of the usual one. However, that happens a lot in today's troubled society, so it might be worth your while to learn 愉しい. (As a matter of fact, there's a LOT of kanji that only occur as a result of auto-complete snafus. Older folks who complain that the internets is making young Japanese kind of illiterate and culturally myopic should be thanking auto-complete - it's responsible for accidentally reviving a whole CLASS of old words! )
Wearing Your Underpants gives me a pleasure I simply can't describe.
He became a butcher because chopping meat gives his heart pleasure.
pleasant or amusing (a funny guy, hilarious comments, a fun time)
|惚||to fall in love with||RIBCAGE|
It gives the BUTCHER pleasure to fall in love with a ANIMAL RIBCAGE.