So strong as to be irresistible:
— An overpowering need for solitude.

synonym: overwhelming.

Roget 159: strong, mighty, vigorous, forcible, hard, adamantine, stout, robust, sturdy, hardy, powerful, potent, puissant, valid.    resistless, irresistible, invincible, proof against, impregnable, unconquerable, indomitable, dominating, inextinguishable, unquenchable; incontestable; more than a match for; overpowering, overwhelming; all powerful, all sufficient; sovereign.    able-bodied; athletic; Herculean, Cyclopean, Atlantean^†; muscular, brawny, wiry, well-knit, broad-shouldered, sinewy, strapping, stalwart, gigantic.    manly, man-like, manful; masculine, male, virile.    unweakened^†, unallayed, unwithered^†, unshaken, unworn, unexhausted^†; in full force, in full swing; in the plenitude of power.    stubborn, thick-ribbed, made of iron, deep-rooted; strong as a lion, strong as a horse, strong as an ox, strong as brandy; sound as a roach; in fine feather, in high feather; built like a brick shithouse; like a giant refreshed.    ... show more

Roget 824: excited etc. v.; wrought up, up the qui vive [Fr.], astir, sparkling; in a quiver etc. 821, in a fever, in a ferment, in a blaze, in a state of excitement; in hysterics; black in the face, overwrought, tense, taught, on a razor's edge; hot, red-hot, flushed, feverish; all of a twitter, in a pucker; with quivering lips, with tears in one's eyes.    flaming; boiling over; ebullient, seething; foaming at the mouth; fuming, raging, carried away by passion, wild, raving, frantic, mad, distracted, beside oneself, out of one's wits, ready to burst, bouleverse^†, demoniacal.    lost, eperdu [Fr.], tempest-tossed; haggard; ready to sink.    stung to the quick, up, on one's high ropes.    exciting, absorbing, riveting, distracting etc. v.; impressive, warm, glowing, fervid, swelling, imposing, spirit-stirring, thrilling; high-wrought; soul-stirring, soul-subduing; heart-stirring, heart-swelling, heart-thrilling; agonizing etc. (painful) 830; telling, sensational, hysterical; overpowering, overwhelming; more than flesh and blood can bear; yellow.    piquant etc. (pungent) 392; spicy, appetizing, provocative, provoquant^†, tantalizing.    eager to go, anxious to go, chafing at the bit.    ... show more