Synonyms of 'bulbous'
If someone's body or a part of their body is bloated, it is much larger than normal, usually because it has a lot of liquid or gas inside it.
His face was bloated.
Convex is used to describe something that curves outwards in the middle.
The lens is flat on one side and convex on the other.
Thesaurus for bulbous from the Collins English Thesaurus
Something that is bulbous is round and fat in a rather ugly way.