Adjectives ending with the letter P are listed in this post.
backup, beat-up, blue-chip
canonship, cheap, claptrap, clean-up, cock-a-hoop, consignment-shop, cramp, crimp, crisp
damp, deep, desktop
fap, flip, followup, follow-up
last-gasp, limp, lop
madcap, midship, mom-and-pop
neap, neck-deep, nonstop, non-stop
paid-up, pent-up, plump, put-up
rep, round-trip, rump
scrimp, sharp, skimp, skin-deep, small-cap, snip-snap, souped-up, speeded-up, standup, stand-up, start-up, steep, steep-up, step-by-step, stepped-up, step-up, stock-ownership, stuck-up
tiptop, top, trap
Hope this word list had the adjective that ends in P you were looking for. Additional descriptive words can be found in the other pages on this site.