Like all prime numbers except 2 Like krypton or radon Like Simon's "Couple" Like an unmatched sock Like most elements ending in "-on" Like the noble gases Like neon or argon Like xenon or radon Like noble gases Like every other number Like 11 or 77 Like 33 Like all but one prime number Like helium Lifeless Like neon Like 1, 37 or 199 Like seven, but not eight Like 21, but not 22 Like 3 but not 4 Like xenon Like every prime but one Like neon Like radon Like argon Like some socks Like 1, 3 or 5 Like Simon's couple Like any number ending in five Leftover Like all prime numbers but 2 Like 11, 13, 15 or 17 Like a lonely sock Like every other number Like 1 or 11 Like 7 or 17 Like half the integers Like xenon and krypton Like 1 or 151 Like helium Like 13 Like argon and krypton Like an unmatched sock Like noble gases Like a single sock Like some gases Like all but one prime number Like an unpaired sock Like 12-Down Like Neil Simon's couple Lifeless Like helium Like Felix and Oscar Like argon and krypton Like noble gases Like some gases Like some jobs Lifeless Left over Lacking liveliness Leftover Lacking a match Like some jobs Left over Lifeless; apathetic Like all primes greater than 2 Like 2019, but not 2020 Like all primes except 2 Like the year 2017 Like all prime numbers but one Like the number of games in a 'best of' series Likely place for a narcissist Less than total abstainer tipples still Like most things in 'Ripley's Believe It or Not!' Lacking a mate Like 2001 Like some holiday shopping Like rare gases Like 43, e.g Like many hasty arrangements Like some holiday shopping Like xenon Languid Languid Like some decisions Like an unreactive gas Like Christmas Eve shopping Like Christmas Eve shopping Like this clue's number Like the gases neon and argon, but not oxygen and hydrogen Like a noble gas Like all primes greater than 2 Like radon, say Like radon, say Like seven, but not eight Like 1, 37 or 199 Like neon and argon Lacking vigor Like 21, but not 22 Like the noble gases Like some gases Like every prime but one Like 3 but not 4 Like argon Like unmatched socks Like a sock with no match Like 1 or 101 Like 7 or 13 Like a nonreactive element Like helium Like 13 Like 1 or 151 Like neon Like an unmatched sock Like the noble gases Like Felix and Oscar Like handymen's jobs, often Like a single sock Like all but one prime number Like Neil Simon's couple Like an unpaired sock Like 12-Down Like half the integers Left over Lacking a mate Like a single sock Like 2015 Like every other number Like almost all prime numbers Like the occasional clean sock Like 2017 Like an extra sock Like the occasional clean sock Like 2017 Like 2017 Like 2019 Like 2015 Like 7 or 17 Like 13 and 321 Leftover Like 3, 5 or 35 Like 7 and 11 Like every prime except two Like 2021 Like 911, and each of its digits Like one Like almost all primes Like most prime numbers Like 41 Like two-thirds of Fibonacci numbers Like all prime numbers besides one Like one Like 27 or 29, but not 28 Like all prime numbers but one Like the first digit of pi Like the number 2021 Like V, but not X Like 2021 Like one or three? Like the two 40-Across in the grid for this answer Lidless container Lidless container Lays on the line Lucrative investment Lucrative endeavour Lucrative activity Lack of economy Lack of economy Lay ___ to (destroy) Lack of economy Leavings Loss without equivalent gain. Left-over cotton fiber. Landfill fill Left over from all sides today Like helium Like a couch potato Languid Like krypton Like the elements on the far right of the periodic table Like helium Like helium or argon Like argon Like neon and xenon Like radon Likely to stay put Like argon or helium Like some gases Lifeless Lethargic Like some gases Like the noble gases Like xenon Like helium Like group 18 elements Like some gas elements Like neon Like the noble gases Lacking vigor Less than slow Listless Lifeless Like neon Like neon and helium Like radon Like argon Like xenon Like some gases Like neon and xenon Like a noble gas Like helium Like helium and krypton Like neon or krypton Like argon or krypton Like helium or neon Like 64-Across Like some gases Like neon or argon Like couch potatoes Like krypton Like neon, chemically Like xenon Like helium Lifeless Like a bump on a log Like krypton and argon Like neon or helium Like Freon or neon Like a dead weight Like neon or radon Like helium, say Like the noble gases Lacking vigor Less than slow Listless Lifeless Like neon Like neon and helium Like radon Like argon Like xenon Like a noble gas Like neon and xenon Like krypton Like xenon and krypton Like argon and krypton Like helium Like some gases Like noble gases Like radon, say