idle
Spelling it out.
A secretary writes letters for a manager.
guider
A secretary
Using only the first letters of a word to form a new word or phrase is called an acronym.
A person who constantly writes letters of complaint can be referred to as a chronic complainer or a serial complainer.
A 'spelunker'
a typist or a keyboardist
cleanshaven.
A player
A person who acts without thinking is usually called "impulsive."
A person who answers without thinking is often referred to as impulsive or rash.