aren

See:

(one's) heart isn't in it
be not all it's cracked up to be
be not fussed (about someone or something)
be not in the business of (doing something)
be not in the same class
be not in the same league
be not rocket science
be not short of a penny (or two)
be not up to scratch
be not up to snuff
be not what it's cracked up to be
be not whistling Dixie
be not worth a brass farthing
be not worth a fig
be not worth a plug nickel
be taking calls
be welcome to (something)
not (just) whistling Dixie
not (quite) right in the head
not a kid anymore
not able to call (one's) time (one's) own
not able to get (something) for love or money
not able to go on
not able to help it
not able to hold it (in)
not able to make anything out (of something)
not able to make head nor tail (out) of (something)
not able to make head or tail (out) of (something)
not able to make heads nor tails (out) of (something)
not able to make heads or tails (out) of (something)
not able to see the forest for the trees
not able to see the wood for the trees
not able to stomach (something)
not about to
not any hard feelings
not anything to write home about
not as young as (one) used to be
not buy (something)
not feeling (oneself)
not for hire
not for publication
not in the same league as (someone or something)
not in the same league with (someone or something)
not long for
not nearly
not playing with a full deck
not so hot
not something to write home about
not the only fish in the sea
not the only pebble on the beach
not to be sneezed at
not to be sniffed at
not too hot
not with it
not worth a plugged nickel
not worth beans
not worth mentioning
not worth the paper it's written on
not worth while
not worth writing home about
There aren't enough hours in the day

aren

AREN