Describes a person who finds things bothersome and avoids effort. Can refer to the trait or a person with that trait. Often used in self-deprecation or mild criticism.
面倒くさがり is a colloquial term for someone who hates hassle; ものぐさ is more traditional and less casual.
Etymology
Compound of 物 (thing) and 臭 (stink), literally 'stink of things', implying a dislike for doing things. The exact historical derivation is uncertain, but the word has been used since at least the Edo period to describe laziness.