TIRESOME

Monotonous

• Annoying

• Awfully dull

• Bor-r-r-ring

• Boring

• Dreadfully dull

• Dreary

• Dull

• Fatiguing

• Ho-hum

• Humdrum

• Like a nudnik

• Not at all interesting

• Old hat

• Platitudinous

• Snoozeworthy, as a lecture

• Tedious

• Wearing thin

• What Felix's attributes can be at times, to Oscar

• Yawn-inducing