We don't have synonyms for underlook yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are underfoot, underwood and undertook.
(v) :
To fail to notice or give due importance to, especially because one is notionally looking too low (found in complement with overlook, as if it meant "to fail to notice because one is looking too high").
(v) :
To look up at from below; to inspect from underneath.
(v) :
To fail to notice or give due importance to, especially because one is notionally looking too low (found in complement with overlook, as if it meant "to fail to notice because one is looking too high").
(v) :
To look up at from below; to inspect from underneath.