sombrero: a broad bimmed hat worn in Spain, Mexico, and some other countries
boater: a straw hat with a hard flat brim
mediocre: neither good nor bad
desolate: lonely and without people
barren: unable to produce crops
toxicology: the study of poisons
gaggle: a flock of geese
staunch: loyal or steadfast; strong or substantial
austere: severely simple; stern or grim
pliant: bending readily; easily inclined or influenced
ulna: the bone of the forearm on the side opposite to the thumb
keel: a ship or boat
rook: a black, European crow
lose one's marbles: lose one's mind
lose one's head: become confused or overly emotional about someone or something
round the bend: crazy
have rocks in one's head: show poor judgement, act stupidly