locked in

adjective

1. informal.
   exhibiting total concentration on the task in hand

Related Words

• adamant
• determined
• hard-line
• hard-nosed
• immovable
• implacable
• inflexible
• intractable
• merciless
• obstinate
• relentless
• rigid
• ruthless
• single-minded
• staunch
• stubborn
• uncompromising
• unrelenting
• unwavering