| irresponsible |
| lackadaisical(adjective, calm, dull, cool, careless) |
| lagging(dull, slow, careless, idle, sluggish) |
| laissez-faire |
| languid(dull, idle, sluggish, inactive, lethargic) |
| languorous(dull, idle, sluggish, inactive, lethargic) |
| leisurely(slow, late, remiss, tardy, procrastinating) |
| lenient(soft, tolerant, slack, remiss) |
| lifeless(dull, careless, idle, sluggish, inactive) |
| like an absent-minded professor(expression, adjective, idiom, careless, sloppy) |
| lingering(slow, late, remiss, tardy, procrastinating) |
| listless(adjective, calm, cool, sharp, rude) |
| loafing(dull, careless, idle, sluggish, inactive) |
| loitering(slow, late, remiss, tardy, procrastinating) |
| looking out window(expression, adjective, idiom, careless, sloppy) |
| lost(adjective, careless, indifferent, apathetic, distracted) |
| mooning(adjective, careless, silly, foolish, senseless) |
| moony(adjective, careless, silly, foolish, senseless) |
| moratory(slow, late, remiss, tardy, procrastinating) |
| musing(noun, adjective, careless, indifferent, apathetic) |