obfuscate
Meaning: to render incomprehensible
Usage: The detective did not want to answer the newspaperman’s questions, so he obfuscated the truth.
abstruse
Meaning: hard to comprehend
Usage: Everyone else in the class understood geometry easily, but John found the subject abstruse.
implicit
Meaning: understood but not outwardly obvious, implied
Usage: I know Professor Smith didn’t actually say not to write from personal experience, but I think such a message was implicit in her instruction to use scholarly sources.
patent
Meaning: readily seen or understood, clear
Usage: The reason for Jim’s abdominal pain was made patent after the doctor performed a sonogram.