1) a person who people find uninteresting and tiring (bore)
2) a tiring job; a cigarette (fag)
3) long, tiring and not interesting (tedious)
4) tiring (the usual word) (wearing)
needing and using much energy and thought
difficult, hard to endure
(of talk, behaviour, work etc) causing a person to lose interest and feel tired
uninteresting
exhausting
difficult, taxing
needing much effort
difficult; requiring hard labor
long, tiring and not interesting
dull, monotonous
annoying
irritating, exasperating