- The city enfolded me in its crushing intensity, the pavement a power in and of itself, forcing me to my sensitivities. (Sensitivities? What are those, exactly? This description would be more engaging if the character focused on what he saw and felt - towering buildings of concrete and glass, hot pavement, tired feet, and a sense of feeling small, unimportant, claustrophobic, or lost among an uncaring crowd.)
- A barrage of cacophony filled my ears. (Even a cacophony is made up of particular sounds. Are people shouting? Is a radio blaring? Are horns honking? The writer could go even further with a strong metaphor describing these.)
- The hidden laboratory was a bizarre compilation of technology, waiting to be explored. (What kind of technology, from what time? Does it involve wiring? Tubing? Alembics? Pickled corpses? Machinery? Bodies suspended in tubs?)
- This was a neighbourhood where people didn't do much. (Was garbage spilled across the sidewalk and left there to rot? Were there rats nosing about the trash heaps? Were watchful, unemployed men loitering on corners? Were there old cars abandoned in the street?)
- Her euphoria reflected the randomness of the instant. (What does 'randomness of the instant' mean? Was her happiness fleeting, or was she not in her right mind?)
When writing, go for specifics rather than what is vague. At the same time, don't go overboard with your description. Many readers lose interest if the description goes on for too long. A few choice phrases of what your character sees and feels should serve you well.