Might come a bit late, but you can start Geany with argument "--no-ctags" to disable autocompletion and tooltips. Other than the name of the argument suggests, this will disable loading of all [default global tag files](https://www.geany.org/manual/current/index.html#default-global-tags-files), not just for C-based languages. Ran into the same annoyance with Python, when Geany even showed me the call syntax of [xmlrpc.client.loads](https://docs.python.org/3/library/xmlrpc.client.html#xmlrpc.client.loads) after typing "json.loads(". (<- worth a bug report?)