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in the PONS Dictionary

II. doubt [daʊt] no pl VB trans

1. doubt (be unwilling to believe):

2. doubt (call into question):

doubt capability, sincerity

3. doubt (feel uncertain):

III. doubt [daʊt] no pl VB intr

Present
Idoubt
youdoubt
he/she/itdoubts
wedoubt
youdoubt
theydoubt
Past
Idoubted
youdoubted
he/she/itdoubted
wedoubted
youdoubted
theydoubted
Present Perfect
Ihavedoubted
youhavedoubted
he/she/ithasdoubted
wehavedoubted
youhavedoubted
theyhavedoubted
Past Perfect
Ihaddoubted
youhaddoubted
he/she/ithaddoubted
wehaddoubted
youhaddoubted
theyhaddoubted