HackerVoca

, performance
observation : noticing, perceiving, watching
observe : 1. perceive, notice, watch
2. comply / / verb [intransitive] formal
to do what you have to do or are asked to do
[+ with]: Failure to comply with the regulations will result in prosecution.
also compliance , conform, follow, fulfill
obstacle : obstruction, hindrance, impediment, interference,block
obstinate /'adjective

1 unreasonably refusing to change your ideas of behaviour, even though people try to persuade you: Harry was obstinate and wouldn't admit he was wrong. | a sulky, obstinate child | an obstinate refusal to face facts

2 [only before noun] difficult to deal with or get rid of: strong enough to remove the most obstinate stains | an obstinate cough

obstinately adverb