From <span class="searchmatch">wetfast</span> + -ness. <span class="searchmatch">wetfastness</span> (uncountable) The quality or degree of being <span class="searchmatch">wetfast</span>....
From wet + fast. <span class="searchmatch">wetfast</span> (not comparable) colorfast such that it will not lose its color after getting wet...
tub-fast ultra-fast fashion ultrafast, ultra-fast unfast washfast waterfast <span class="searchmatch">wetfast</span> firmly or securely fixed in place firm against attack of friend: steadfast...