arduous

Every thought was bent to attain the end, no labour was deemed to arduous.

How arduous and delicate they were may be readily understood.

In the Winter of 1841, his duties were most trying and arduous.

It is I, not she, at this rate, that must fail in the arduous trial.

Engage not in so arduous and important an enterprise immaturely.

I know that a journey, according to their habits, will be painful and arduous, but it may be borne.

The ladder of psychic development is long and arduous to mount.

His success in this arduous undertaking has been great indeed.

In the evening she relieved Nadine Holt from her arduous duties in the sick-room.

Is the journey between this and the Salt Lake you speak of an arduous one?