laggard

noun

1. a person or thing that lags; lingerer; loiterer.

adjective

2. moving, developing, or responding slowly; sluggish; dilatory; backward.

noun

1. a person who lags behind
2. a dawdler or straggler

adjective

3. rare sluggish, slow, or dawdling

1702 (adj.), from lag (v.) + -ard. From 1757 as a noun.