1 : not easily borne; wearing; "the burdensome task of preparing the income tax return"; "my duties weren't onerous; I only had to greet the guests"; "a taxing schedule"
2 : making great mental demands; hard to comprehend or solve or believe; "a baffling problem"; "I faced the knotty problem of what to have for breakfast"; "a problematic situation at home"
adjectif
1 : of the military or industry; using (or being) the heaviest and most powerful armaments or weapons or equipment
2 : of comparatively great physical weight or density
