because they want to carry out the day activities without undue fatigue.
is not allowed
2 and 4
Having fatigue doesn't mean you have a STD.
No, "undue" is not a preposition. It is an adjective used to describe something that is excessive or unwarranted.
"Je suis fatigue aujourd'hui" means "I am tired today" in French.
undue reliance
Fatigue/malaise
Chronic fatigue syndrome
A narrow-minded person who pays undue attention to formal rules
Undue
Its means pain