Relentless and indefatigable in pursuit or as if in pursuit.

synonym: dogging.

Roget 141: stable etc. 150; persisting etc. v.; permanent; established; unchanged etc. (change) etc. 140; renewed; intact, inviolate; persistent; monotonous, uncheckered^†; unfailing.    undestroyed, unrepealed, unsuppressed^†; conservative, qualis ab incepto [Lat.]; prescriptive etc. (old) 124; stationary etc. 265.    ... show more

Roget 604a: persevering, constant; steady, steadfast; undeviating, unwavering, unfaltering, unswerving, unflinching, unsleeping^†, unflagging, undrooping^†; steady as time; unrelenting, unintermitting^†, unremitting; plodding; industrious etc. 682; strenuous etc. 686; pertinacious; persisting, persistent.    solid, sturdy, staunch, stanch, true to oneself; unchangeable etc. 150; unconquerable etc. (strong) 159; indomitable, game to the last, indefatigable, untiring, unwearied, never tiring.    ... show more