IPA: /ˈtɛr.i.ɪst/
KK: /ˈtɛrɪɪst/
The most delayed or slow in action or movement; taking the longest time to do something.
He was the tarriest of all the guests, arriving an hour late to the party.
Comparative: tarrier
Superlative: tarriest
The word 'tarriest' is derived from 'tarri' (from Middle English 'tarien', meaning to delay or linger) and the superlative suffix '-est' (indicating the most). Thus, 'tarriest' means the most inclined to delay or linger.
Think of someone who is the most likely to 'linger' or 'delay' — that's what 'tarriest' means.