respectfully / respectively
With respect versus in the order named.
Respectfully means with respect: Respectfully yours. Respectively means in the order named: Lee and Dana filed the brief and the log, respectively. Do not use respectfully for the order.
Examples
Use She answered respectfully.
Use The red key and the blue key open the gate and the shed, respectively.
Avoid The red key and the blue key open the gate and the shed, respectfully.