notion (noun) [countable]

/ˈnoʊ.ʃən/

a belief or idea

He didn’t have a clear notion of what he had to do.

congested (adjective)

/kənˈdʒestɪd/

crowded; full of traffic

The roads to Bordeaux were heavily congested.

deliberately (adverb)

/dɪˈlɪbərətli/

intentionally

I'm sure he says these things deliberately to annoy me.

buzz (noun) [ C usually singular ] informal

/bʌz/

a feeling of excitement, energy, and pleasure that something gives you

e.g., I get a buzz out of public speaking.

hooked (adjective)

/hʊkt/

‌if you are hooked on something, you enjoy it very much and you want to do it as often as possible

e.g., Her friends talked her into playing golf, and now she's hooked.

obstacle (noun) [countable]

/ˈɑːb.stə.kəl/

a situation, an event, etc. thatmakes it difficult for you to do or achieve something

e.g., A lack of qualifications can be a major obstacle to finding a job.

decline (verb) [intransitive]

/dɪˈklaɪn/

to gradually become less, worse, or lower

e.g., The animal's numbers are declining rapidly.

ulterior motive

a secret reason

e.g., He’s just being nice. I don’t think he has any ulterior motives.

in excess of something

more than something

e.g., Many of the doctors here are working in excess of fifty hours a week.

prodigious (adjective)

/prəˈdɪdʒ.əs/

very large or powerful and causing surprise; impressive

e.g., Americans are the world’s most prodigious consumers.