Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
toilsome is an adjective meaning "characterized by effort to the point of exhaustion; especially physical effort". It carries one recorded sense.
characterized by effort to the point of exhaustion; especially physical effort
“worked their arduous way up the mining valley”
“a grueling campaign”
“hard labor”
“heavy work”
“heavy going”
“spent many laborious hours on the project”
“set a punishing pace”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for toilsome come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.