n. 25B6; verb the company endeavoured to expand its activities : TRY, attempt, seek, undertake, aspire, aim, set out; strive, struggle, labour, toil, work, exert oneself, apply oneself, do one's best, do one's utmost, give one's all, be at pains; informal have a go/shot/stab, give something one's best shot, do one's damnedest, go all out, bend over backwards; formal essay.
25B6; noun
an endeavour to build a more buoyant economy : ATTEMPT, try, bid, effort, venture; informal go, crack, shot, stab, bash; formal essay.
several days of endeavour : EFFORT, exertion, striving, struggling, labouring, struggle, labour, hard work, application, industry; pains; informal sweat, {blood, sweat, and tears}, elbow grease; Brit. informal graft; Austral./NZ informal (hard) yakka; poetic/literary travail.
an extremely unwise endeavour : UNDERTAKING, enterprise, venture, exercise, activity, exploit, deed, act, action, move; scheme, plan, project; informal caper.