I have that happened to some of my adeniums too, which I initially thought the tips are getting sunburned. However I noticed this is happening to the ones in part shade too that I am withholding watering since they are newly repotted ones.
And that adenium looks healthy and actively growing. If you are moving it from shade to full sun area, make sure to make a gradual exposure to sunlight.
As @deep south noted the brown tips are a water issue, but not a serious one at this point. I don't see any signs of sunburn but @Kaktus is correct that exposure to more intense sunlight does require a gradual move. Your plant looks healthy. I see that you are in central Florida (as am I). If you are growing your plant outside and not under cover from rain excess water is common. The best way to make sure your plant survives our sporadic deluges is to be sure it is planted in a very well draining mix. If you bought it from one of the big box stores it is likely planted in mix that retains too much water for our area. The suppliers of these plants grow them under cover and can water them on schedule. This may help you with finding a mix that works for you. https://garden.org/thread/view...
My issue is definitely watering. I have been counting on the "rain" forecast that sometimes doesn't come. Also, I read something that if leaves that used to be green and flat all of a sudden starts curling upwards, it is the sign of under watering.
to NGA. And 
@Lucy68 for tagging me. Our resident experts though are @deepsouth, @wildbloomers @kaktus.
tips. 
