the GNU version of the Collaborative International Dictionary of English
adj. requiring great physical effort. Opposite of effortless.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. requiring great physical effort
Word Usage
"Research is cited that supposedly shows that readers are vulnerable to a kind of cognitive incaution and "must engage in effortful processing to disbelieve the information they encounter in literary narratives.""