What is the meaning of Waart?

second-person (gij) singular past indicative of zijn

inflection of waren:

1. second/third-person singular present indicative
2. plural imperative

second/third-person singular present indicative

plural imperative

second-person plural preterite indicative of sinn

inflection of waarden:

1. third-person singular present indicative
2. second-person plural present indicative
3. second-person singular/plural imperative

third-person singular present indicative

second-person plural present indicative

second-person singular/plural imperative

Source: wiktionary.org