What are the best answers for “the quality of requiring extended effort”?

laboriousness, operoseness, toilsomeness.

How many letters does the top answer for “the quality of requiring extended effort” have?

The most common answer is laboriousness (13 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

laboriousness 13 letters wn-def

the quality of requiring extended effort

operoseness 11 letters wn-def

the quality of requiring extended effort

toilsomeness 12 letters wn-def

the quality of requiring extended effort

the quality of requiring deliberate effort 60% similar → effortfulness

the quality of requiring little effort 60% similar → effortlessness