Obfuscate

Mnemonic:
fus in the word fussy.
Obfuscate means make something fussy => difficult to understand

Meaning:
>> Obfuscate means make something fussy.
>> To make sth less clear and more difficult to understand.
>> Obfuscation is the concealment of meaning in communication, making it confusing and harder to interpret.

Synonyms:
batten, conceal, darken, eclipse, quash, smother, squash, squelch, stifle, suppress, swoon

Definition from GREword.com