HackerVoca

robust : sturdy, vigorous, stalwart
rot : decay, corrupt, degenerate1 / verb [intransitive]
to become worse
[+ into]: The debate soon degenerated into petty squabbling.
degeneration / / noun [uncountable]
rotate : turn, spin, revolve, wheel, roll
rotten : decayed, foul, corrupt
rough : uneven, irregular, rugged // adjective

1 land that is rugged is rough and uneven: rugged terrain | a rugged coastline

2 a rugged car or piece of equipment etc is strongly built and not likely to break easily; sturdy

3 a man who is rugged is good-looking and has strong features which are often not perfect: Ann admired his rugged good looks.

4 rugged behaviour is confident and determined but not always polite

ruggedly adverb ruggedness noun [uncountable] , violent, wild