adj.
Pronunciation: ( ˌ )in- ' val-y ə -b ə l, -y ə -w ə -b ə l, -yü(- ə )-b ə l
Function: adjective
Etymology: 1 in- + value, v. + -able
Date: 1576
: valuable beyond estimation : PRICELESS <providing invaluable assistance>
– in · valu · able · ness noun
– in · valu · ably \ -bl ē \ adverb