Nouns ending in -ail, -eil, -euil, or -ueil are masculine.
The whole family: -ail, -eil, -euil, -ueil. All masculine.
Is conseil masculine or feminine?
leconseil
The rule behind it
100% of -ail / -eil / -euil / -ueil nouns are masculine
In context
Il a ignoré les conseils de son père.
He ignored his father's advice.
Pourquoi ne pas demander conseil à ton professeur ?
Why do you not ask your teacher for advice?
Je te suis très reconnaissant pour ton conseil.
I am very thankful to you for your advice.