respectfully / respectively
Doing something respectfully means full of respect and admiration. But respectively means “in the order given”.
simple / simplistic
Simple is not quite the same as simplistic. Being simplistic means trying to explain something complicated as being simpler than it is; that is, oversimplifying. Something that is simple is uncomplicated.
stationary / stationery
When you are stationary, you are not moving respectively to anything else; when you write a letter to someone you use stationery.
tortuous / torturous
Tortuous describes something like the long and winding road; whereas torturous describes something pertaining to torture.
unexceptionable / unexceptional
When something is unexceptionable, it is without exception or objections; when something is unexceptional, it is simply plain and ordinary.
See other: Choose Your English
Knowledge Guild 