Fatuous

Fatuous
foolish or done without thinking.

Zenith

Zenith
The highest point.
 The sun reaches its zenith at midday.

Hound

Hound
A hunting - dog .
The fox threw the hounds off the scent and escaped.

Bereavement

Bereavement

the death of a close relation or friend.

The family has suffered two bereavements recently.

Hypothesis

Hypothesis: plural hypotheses .
an idea or explanation for something that is based on known facts but has not yet been proven.
Several hypotheses for global warming have been suggested.

Foster

Foster
to look after for a period of time; to bring up a child that is not one's own.
She fostered the children for several months.

Crutch

Crutch
a stick with a piece that fits under the arm, which you lean on for support if you have difficulty in walking because of a foot or leg injury

Martin broke his leg playing football and has been on crutches for the past six weeks.