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in the PONS Dictionary

un·du·lat·ing ['ʌndjəleɪtɪŋ] ADJ form

1. undulating (moving like a wave):

undulating
undulating

2. undulating (shaped like waves):

undulating hills
undulating landscape

un·du·late ['ʌndjəleɪt] VB intr form

Present
Iundulate
youundulate
he/she/itundulates
weundulate
youundulate
theyundulate
Past
Iundulated
youundulated
he/she/itundulated
weundulated
youundulated
theyundulated
Present Perfect
Ihaveundulated
youhaveundulated
he/she/ithasundulated
wehaveundulated
youhaveundulated
theyhaveundulated
Past Perfect
Ihadundulated
youhadundulated
he/she/ithadundulated
wehadundulated
youhadundulated
theyhadundulated