merklich
Translation
noticeable, perceptible, appreciable, marked
Examples
Es gibt einen merklichen Unterschied.
There is a noticeable difference.
Die Temperatur ist merklich gesunken.
The temperature has dropped noticeably.
Grammar Patterns
(as adjective) noticeable It's a noticeable improvement.
(as adverb) noticeably His health has improved noticeably.
Similar Words
Synonyms: spürbar, deutlich, sichtlich; Antonyms: unmerklich, kaum wahrnehmbar
Etymology
From the verb 'merken' (to notice) + the suffix '-lich' (similar to English '-ly' or '-able'). So, literally 'notice-able'.
Memory Tips
If you can 'merken' (notice) it, then it is 'merklich' (noticeable). The connection is very direct.