substitute
to use something or someone instead of another thing or person
solid
hard, firm
multiple
single, sole
lose count
I've lost count of how many times she's been late for work this month.
ascertain
to discover something
sth doesn’t add up
sth doesn’t compute
flawed
perfect, immaculate, impeccable, flawless
out of the ordinary
For the police, the incident was nothing out of the ordinary.
timidly
in a shy or nervous way
solitude
isolation, loneliness
fuzzy
clear
unconstrained
The beauty of fiction is that it's timeless and wholly unconstrained by reality.
low-key
quiet and without a great show of excitement
adjacent
neighbouring
diverse
identical, uniform, same
dawn on sb
I was about to pay for the shopping when it suddenly dawned on me that I'd left my wallet at home.
nifty
good, pleasing, or effective
feisty
active, forceful, determined
vibrant
boring, lifeless
draw a blank
He asked me for my phone number and I drew a blank - I just couldn't remember it.